EHG is very open to this, but it causes a lot of extra work.
Animations + Rigging are probably the two biggest ones, since all gear (including MTX) needs to be readjusted
Voice acting
There is a humongous thread about this topic (I think this is the largest thread on the forum that is not a dev post/blog)
It has some insights form the devs themselves as well. It is very old at this point but everything still applies. (One thing that actually disappeared from the amount of work that needs to be doen is the character introduction. All classes had a short motion comic clip at the start. This is no longer there and hence doesn’t need a rework).
I think once 1.2 is released and depending on how the feedback on endgame will be this is one of the topics that might get worked on. At this point EHG is a much bigger studio than it was back then. So whiel its still a lot of work it might be more realistic now.