I hate it when people say "keep shifting goal posts" in the most random contexts to sound pithy.
I said no OEM wants their engineers to have a capability and you're fixating on the uses of the capability.
My comment is saying it doesn't matter if they wanted to use it for something as trivial as ECU updates, They. Do. Not. Want. It.
If you want a case study in why, AP regressions are a fine one.
They don't want the liability when an updates goes wrong and kills people. They do not see people's lives as prod vs dev. They do not want to hotfix safety critical systems. They want to get it right the first time, and that's why they're conservative and by god, they get it right a lot more than they get it wrong.
Because no matter how much spin TSLA fanboys put on these things, they are liabilities as much as, if not more, than they are strengths, especially combined with the flippant approach to valuing human life the company that called Adaptive Cruise Control + Lane Centering "Autopilot"