Regarding the specific meta CLU question you posted, I do agree that tech support questions should be off-topic on a language site. However, I do think you could've phrased the question a lot better. Right now, it says:
Computer setup questions off topic
Can we please make sure we close quickly any question asking about set up of software. For example IMEs that are not working.
These are off topic on every other site as they are way too localized.
It reads (at least to me, as an outsider) as if you've made up your mind already and you're admonishing the community for not closing these questions faster. A better argument could've been made by reasoning why these are not good questions, and suggesting that the community should discourage such questions.
Now I don't know how difficult it is to enter Chinese characters in your questions and answers (it could be as simple as touch typing or as crazy as having to look through a font book to select it). However, it seems like a reasonable question that beginners and newbies might have. Since it is off-topic on the main site, why not open up a meta question tagged support and keep a collection of troubleshooting/installation help for the most commonly used software & operating systems? That way it is out of view from the general question pool, yet remains where it belongs.
Most people when arguing for these types of questions think more along the lines of 'how can we ensure every gets their questions answered' rather than 'how do we build a quality site'.
I agree that there are a lot of users who are reluctant to close and want to let anything and everything live, despite it not being a worthy question. In such cases, it is important that the pro-tem moderators (if they're appointed) take a hard stance where the community is unwilling, yet be open to concerns and differing viewpoints from the community and be ready to reverse their decision without feeling snubbed.
A few things that I've learned from moderating two beta sites (and from mistakes made) that might be relevant to some of the issues you're facing on CLU are:
1. It is probably better to have the discussion again or recap the policy on your meta
Every country probably has a law saying robbery is a punishable offence. Yet, you don't point to country B's laws to prosecute a crime in country A. If you're a newly formed country, you adopt (and modify) laws and policies from the most appropriate country, and form new ones of your own as and when required (and ignore ones that don't apply).
The same applies to beta SE sits. I know that similar questions have been hashed elsewhere, but I do believe that instead of just pointing users to links elsewhere (even if it's the SE blog) and closing the discussion, a short recap of why it is a bad idea, a couple of quotes and relevant links will go a long way in reassuring the community (especially those users that don't identify with any other community or have never been a part of SOFU history).
Focus on the reasoning rather than the conclusion. Most sensible communities will arrive at the same conclusion given the same reasoning, and you won't look like an ass. I personally would hate to be told bluntly that I can't ask a question on site X just because some chap didn't like such questions on site Y.
2. Compromise and adapt to your community's needs
Expanding on the "adopt and modify laws" part in the analogy above, it is important to understand the community's needs and do what's best for your community, despite what others do in similar circumstances.
For example, Apple.SE openly allows shopping questions and anything that makes them smile or catches them off-guard (despite criticism from experts who are less inclined to participate because of these) . However, such questions are insta-closed + deleted on Super User (which is where the whole "no shopping recommendations" policy started). On gardening.se, we allow plant recommendations (which are akin to shopping questions), provided the requirements are narrow. Recently, we were faced with a couple of shopping questions (one of which was yours). While they were closed initially as per general policy, I believe we managed to come to a compromise on such questions (going by the upvotes & comments) and one of them (yours) was reopened immediately.
So the message here is that some communities have slightly different needs, and so engaging in a discussion might help reach a compromise.
3. Develop a healthy chat culture
One of my suggestions in the gardening meta post was to open a specific chat room for a specific purpose. While I've been suggesting this to people for off-topic but useful questions, I was skeptical about it until I experienced what it could do, given an active chat room.
Recently, I happened to be chatting in the mathematics chat room, when a user posted a request asking if someone could plot a graph for him, as he was away from his software. I saw that and started to open up my copy of Mathematica. But before I could get around to it, he already had two responses! I've had similar experiences in other chat rooms too (especially with users dropping in to check if a particular question might fit in), but this was an example that was recent enough that I could easily remember and grab from the transcript.
Now did the asker's reputation in the community factor in? I don't know. But I certainly am impressed and certainly believe that given enough activity, chat is a good option for off-topic questions. Take this opportunity to cultivate an active chat room when it's young. It gets a lot harder as the days go by.