This is a user to user Forum, so you are not really addressing Adobe here, even though some Adobe employees thankfully have been dropping by.
The proper place for feature requests is
And personally I oppose your (edited) request.
Apart form the principal differences of the applications’ approaches the Illustrator team does in my opinion have a bad track record with bug fixing (which may be more about management’s distribution of resources than about the team members’ capabilities or ambitions) and Illustrator’s path handling is in some regards inferior* to Photoshop’s so better to keep that away from Photoshop.
Edit: Admittedly bug fixing for Photoshop may also be below many users’ expectations, though.
*) The adjectives I would like to employ to describe just how inferior would be inopportune on this Forum.
that's why i am saying keep it in 3 states. 1) ps 2)Ai 3)Ai+Ps.
The way I, as a layperson, see it apart from the challenges of merging two programms with so vastly different approaches that would (even if code from both of them could actually be maintained in the third, new application) in all likelyhood increase testing and maintenance requirements remarkably without actually providing new features.