I'm not familiar with all the charging specs, but I think the older USB (A?) connectors will/may be limited in current. If I understand it correctly, the same applies to the charging brick/wall wart.
I know my watch needs a specific cable and charger to allow fast charge, for example, and most other chargers will charge much slower than the Watch can handle.
At this point, my reference to chatter, above, is just that: it's chatter; speculation. To the best of my knowledge no such attempt has been implemented.
I would hope Apple does not get so petty as to do this.
I too have many USB-C ports in the Model Y as well as one 12v socket and a dual charging pad for phones.
Those wacky Euros.
Ultimately, I would agree that a universal system be in place. Can't say I understand the ins and out (if any) of the different connectors, but I will say the Tesla connector is small and sleek in comparison to some I've seen.
*shrugs
Most of these changes likely won't be in play for several years... so until then may the curse of adapters plague us all.