Reporting that I've read is that Beal signed with the Clippers because he was offered a starting role. He did not seriously consider teams that weren't offering that.
His goal seems to be to rebuild his value and get another check once his deal is done. I don't think you do that coming off the bench. All things being equal easier to send someone you traded for to the bench than someone you made a promise to who signed with you. Well see what Tyu Lue does.
I think the argument would be it doesn't matter if Kawhi isn't guarding fours if he's forced into a position where the defensive load is even greater cause he's having to cover for Harden, Beal, and Collins.
Be curious to hear/read more about Collins being a better defender than Utah showed. That's definitely not my recollection of him in Atlanta. Him being a neutral defender is still probably not good enough. Who is guarding Ja, Shai, Booker, Ant, etc. obviously not Harden, tried it with Beal in Phoenix and it was ugly, and I dont think Kawhi can stay in front of the quicker guards like he used to.
I think, obviously, a starting lineup with Beal and Collins has a high offensive ceiling but it doesn't matter if they score 115 every game but give up 125. The bit of success the team had came from them playing defense imo. That was the identity.