When someone language starts incorporating language like change "screwing over a job", I start to think that now we are getting closer to one of the intrinsic reasons or even unconscious reasons that is the basis for their resistance to change.

Even the hint of change and the possibility that some people won't be able to adapt in the highest levels of content is simply not acceptable to them.

Well, this rather silly to me, I haven't played a game yet where those roles/classes in which updates were introduced, in which players at intermediate and certainly high skill levels (equivalent to Savage, Unreal) levels adapted or were left behind. In some cases, skills were modified, in some cases rotations were modified, in some cases skills were erased- whatever. Sometimes we had to wait a year or more if if was detrimental to QOL.

We even saw this recently applied to healers in PVP (I realize PVP is different, but bear with me). Those people who were used to being dedicated healers in FFXIV either adapted to very different support jobs in the present PVP design, or they likely re-rolled or stopped PVPing. They couldn't continue in the old way of PVPing, all healers were changed.