Many answers claim that a collective decision on subjective issues; such as what is off-topic is just a waste of time. But too often they forget that newcomers are often clueless about what is considered off-topic and which site they can post their question. As a result, often, newcomers submit the same question on more than one SE site, which leads to a greater loss of time for regular users and mods alike as they try to sort out the confusion. After that, many users come to Stack Exchange Meta to ask where can they post. In fact, there is a site recommendation tag for that very purpose: site-recommendation
Obviously, moderators are human beings and everyone has a different opinion on subjective matters, i.e. what is on-topic or not. This means that users may go to multiple sites and have discussions with multiple site moderators which leads to discussions, feelings of resentment, frustration, and still with no clear idea where to post their question.
However, if the moderators could, collectively, take a decision on subjective matters, it would avoid subjective validation, save time, energy and be helpful to everyone.
As an example, Server Fault had a discussion to not allow questions on panels in April 2015. But the links given to me by the Webmasters moderator justifying why panel questions are suitable for Server Fault clearly show that Server Fault moderators are allowing questions on panels even after April 2015:
Often on Stack Overflow sites, an off-topic question is single-handedly put on hold by one mod and then deleted by the mod. Would it not be better if 4 or 5 moderators collectively decided when to delete a post as off-topic and on subjective matters?
Also, when a moderator suggests an alternative SE site for posting the question, would it not be better if the mod of that site asked the other site mods whether the particular question is off-topic or not on that site?
I faced this precise experience when I posted a question on one site, the site admin told me that the question was off-topic and to post on another site. Which is what I did, but then the second site mod told me to post my question back to the previous site and they too, also deleted my question. The mod even gave me a link showing that the previous site had questions on that specific topic. Now, I have left that second site.