This form is more than a year old.
It’s on the help center page and therefor only a small number will be looking for it. I don’t think anything will change about the “throwing” a comment at the page, like you would do on fb, twitter and the likes.
I can’t imagine that this form is used often.
This form should have a link/button in the video player or near the comment section, or it will be forever in the corner “in good intent”.
like @teufelchen_netty_266 I used it, and requested subtitles with NO results. That’s there for show like many other stuff here bc they ignored my request although I followed the instructions to the ‘‘T’’