I will not delete my original answer, I'll let it stay on the public record so people who agreed with my original answer can vote this one down.  OTOH I've decided that it is not worth using that comment any longer.

As I have been reminded on this thread by @SamIAm, the OP *does* get explicitly notified when their question is edited.  I'd completely forgotten about that.

Thinking for a while that I might just move the comment to the edit reason (which I typically leave blank, on the a basis that it is easy to see in the revisions what has been changed - that plus expedience), I've also rejected that for two reasons.

1. The 'little comment app.' that I wrote specifically for my copy/paste comments (I have a lot of them) is only set up to provide a single comment area, and I could not be bothered changing it.  The technical comments are far more important and useful.
1. It might be seen that I am trying to 'hide' such advice in the edit comments out of general view to avoid criticism.  If I'm going to write something, I'd prefer it to be in public view where it can be flagged or critiqued.

If I'm editing, I **do** think it is worth adding a '?' to questions. But I'll just make the edit & move on without further comment. 

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I truly thought I was helping the questioner as well as the general community, but that confidence is now much weaker.  So I'll write no more on the '?'.

I *still* have a few comments in the app. that relate to what people consider grammar as opposed to being purely technical.  I'll review those over the next couple of days.  Probably most of them will go, possibly all of them.