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IDs still collab, Bae still collabed relatively recently (3 months ago), Mori and Kronii only collabed with Vesper and Magni who are currently dead and probably won't come back
due to these circumstances, it's not entirely accurate to say the collabs have stopped, but let's entertain the thought that a change in course has actually happened
the early HoloEN/StarsEN collab galore was unusual for Hololive standards, it was an attempt to include StarsEN in the same group as HoloEN
this failed dramatically: HoloEN viewership cratered, StarsEN growth started well, and outpaced StarsJP by a lot, but eventually stalled while their viewership has been on a continuous decline since debut
some girls were not on board with this attempt (and why would they, they signed up for Hololive when it was girls only or at the very least when it was following the JP model gender segregation) so this attempt caused a lot of stress for them as they were continously pestered for Stars collabs
for the ones that did, there was instead the stress of dealing with the outraged gachikoi in their audience, which exist even on the EN side, even though they're not as rabid as the JP equivalent
they also lost a lot of their core audience: the girls that collabed with StarsEN have suffered on average a much steeper drop in average viewership than the ones that didn't
tl;dr the intergender collabs brought a ton of negatives and barely any postives, expect StarsEN to conform to the StarsJP model of mostly ignoring the girls and occasionally collab with the ones they have actual friendly relationships with. no more collabing for the sake of collabing