considering changing these will require going into skills menu -> unequipping the ones you want to swap -> equipping the ones you want to use -> then changing your hotbars to incorporate the changed skills.
I do not see the vast majority of people ever changing them once set outside of maybe raid groups.

They do kind of serve as a way to remove some buttons though. Instead of having esuna + a cross class skill you now just have esuna as a cross class skill.
It kind of looks that way for a lot of this, like a new healer only virus. Scholar and astro had virus/disable already + a cross class skill, and now they'll just have the new virus
looks the same way with mp regen skills too. Maybe the mp regen on aetherflow got moved to summoner as a passive skill because if that really is mp regen scholars will get to go crazy and never worry about mp ever.

But everyone is getting reworked skills and 5 new skills so i'm sure most "lost" things have new unknown replacements.
It honestly looks like a lot of classes will be very different from their current state too

I do imagine the pull skill will get severely nerfed or changed completely within couple patches if people use it the way it seems like