> In that world, Tesla would have had to switch their cars over to CCS eventually and retrofit their existing chargers to CCS, and people who bought Teslas with the proprietary plug have a terrible UX of needing adapters everywhere.

They've switched to CCS in Europe and as far as I can tell it's going just fine for them. Not sure what would motivate them to pull this risky move besides an insane love for their customers' UX (which ... I doubt).