Cars have always been in the domain of aftermarket modifications, and Tesla is not expected to support matrix headlights any more than GM is expected to support superchargers installed by the owner.
People keep talking about gateway configurations like it's the landscape of Android phones but it's not the same at all IMO. Everything in a car is "mission critical" and I don't think we should give Tesla a pass for locking down a trivial aspect of our cars which have been modifiable for decades. The gateway configuration is literally just a text file read by the OS; the implementation of said features are done discretely within components, communicated over CAN. Everything is highly standardized, modularized, and there is absolutely no risk of an OTA update hitting a bad config with factory parts as it currently stands.
That obviously won't last forever but within comparable versions, this will hold true. But in the larger picture, manufacturers will continue advancing this draconian logic, forcing us into obsolescence, if we don't present
some friction in these practices.
I think stopcrazypp is right in that the average person should just take the easy route and get a newer car if it matters so much to them. A select few of us who care about the rights of modifying or repairing our property will keep on trying to force the issue, and everyone else will benefit from it. If it's a fight worth picking then good, and if not, then that's also good.
Either way, it's nothing to get too upset over. As others have said, the matrix headlights are a marginal improvement at best, and some of the best capabilities (selective dimming, adaptive response to curves, etc) aren't event on the table now. For me it's an exercise in unlocking my car and helping others to do so too by understanding the electronic infrastructure. (it's also really cool)