It's not a reach when YouTube was specifically named as the reason that youtube-dl will be "absolutely useless".
That was what was clearly stated.
Whereas it is a reach, ironically, for you to assume that all WWW sites are like YouTube, especially given the discussion of "extractors" that I pointed to, and even are moving targets.
As I said before, this premise, that you have assumed like AshamedCaptain, is highly erroneous. I suspect that neither of you have actually looked to see what WWW sites out of the hundreds that youtube-dl works with actually do have changing HTML, and how many of the "extractors" are still happily working years after they were written. (Sadly, the open issues list on GitHub, which would have helped to determine this, is gone, GitHub being a single point of failure.)
This is just entirely erroneous assumption and hyperbole, that everything is like YouTube, that things will change "a million times", and that magically all of those hundreds of WWW sites will stop working and "you will not be able to use it for anything".