
This should make clear why the devs want to change rupture characters
I didn't include S.Billy's W-Engine because that may be considered a spoiler.
All rupture W-Engines are basically the same:
-%HP as a main stat.
-Give 20% of crit rate.
-Give elemental sheer damage.
The fact that all the W-Engines of the Rupture characters are so similar already tells you a bit about the identity problem that Rupture characters have, beyond the problems of their class itself.
That's why it makes a lot of sense that during the last dev-talk, one of the proposals from the developers was to "Rework the Rupture class," probably because they themselves are aware of this problem.
Realistically, and without discrediting the developers, I don't think they'll actually give the Rupture class a new purpose or modify the existing Rupture characters.
"Why?" Because that would take considerable effort and time, which they probably can't afford. Although, of course, if they do that, then they'll be the best developers.
What I think they'll do is create a support character for Rupture that changes its gameplay, something like the Dahlia from HSR, or make future Rupture characters more differentiated in their gameplay.