Something i wanna try at some point, is to make all faces in a file equal to the background, except for comments, so as to read only the comments of a file. Or read only comments and function definitions. Or only function definitions and variables.
So, yes, definitely sounds worth a try to me. Be fun to figure out how to do it if nothing else :D
You can have the best of both worlds, by switching themes with appropriate coloration whenever you like. In emacs there are a ton of themes, each with it's own emphasis on coloration, but you can also make your own easily, or tune an existing one. I have commented already on how to tune one, using modus themes, on the same thread.
Not convinced by 'should' because it seems like it would make it easier to not notice a comment that needs updating and humans in general (myself definitely included) are bad enough at that already.
(Note that that doesn't mean I'm arguing that it's a -wrong- choice, just yet another trade-off to be considered)
You can create different themes, like a comment theme, in which every part of the code is invisible (i.e. hex value black) except for the part you want visible, comments in that case. Then when you want everything visible again, you toggle the loaded theme.
I don't know if i will create such themes myself, my github account is on github/pramatias. I may upload something in the future, or may not.
[1]https://gitlab.com/protesilaos/modus-themes/-/blob/main/modu...