There's always going to be meaningful applications of certain "less valued" abilities compared to the FOTM darlings, there's no question about it. Blizzard's already
reverse-engineered some intended applications, sometimes to the detriment of certain fights (like the Stoneborne Generals intermission in Castle Nathria, Zzzzzzz). I think the issue is that the mindset of players cultivated for 16 years is going to be that they're going to be happy with what gives that benefit the
most often or in the situations that call the most for it. Not all fights, dungeons, and zones are going to be equally difficult, which means even if Situation A favors Ability A, it still won't feel as good as B wanting B.
Is that partly on the players and that same cultivated mentality? I'd...argue no. I think that's in the DNA of the game. Even in Vanilla, respecs were possible if you could front the gold through farming. The opening of ease happened
because of the player demand and the culture surrounding the flexibility of experiencing all a class was meant to offer. Now we're approaching an expansion priding itself on re-establishing class over spec identity, but this generally torpedoes that, because you won't enjoy certain other specializations as much. Are they gone? No. Are there meaningful applications? Yes, you are absolutely right. But it's a fly in the soup that never needed to be there and hasn't been for almost two decades. It is an invention.