For me, it's really simple. I have YT Premium subscription. If they break Firefox or yt-dlp to the point of unusable, I will cancel my subscription.
IME the only thing Premium is good for is getting rid of most ads and enabling background playback in YouTube's official app.
In any case, I am using YTP as a leverage. It's well-known Google doesn't like Firefox and yt-dlp, so I am using those with YTP to make the point that maybe they should think twice about it.