why would they change, they just got themselves a braindead army of fanatics after becoming first party,I think they are just really used to this engine, and don't want to have to learn a new one before they retire.
who would defend anything and everything for them, do free damage control and harass reviewers, who dare to point any issues.
we are pretty much stuck with this archaic shit of an engine i'd say.
all you can hope for is bandaids on top of bandaids.