I'm not totally following what you're saying, but I can answer this:
> Is a wontfix with lots of comments more expensive, than a wontfix with comments blocked?
Yes, it is more expensive. When 100 developers are CC'd on a bug that is generating regular "but did you consider this argument?" comments, it's a lot of overhead.
You could argue that everyone CC'd should remove themselves from the CC list when this happens, but by that time we'd already have taken the hit.
These bugs are not fun for anybody, dev or unhappy user alike.
This isn’t a bug though. It’s a feature request where the devs have already vocally said no. This idea that opening an issue for a feature somehow implies that it will eventually get implemented seems so wild.
If I opened an issue asking Firefox to switch their rendering engine to Blink you better bet it would be closed wontfix and stay that way for a long ass time.
Shame you cant "give the devs opinion" on bugzilla.