Don't buy a car that doesn't have something hoping it'll magically appear later.
Currently, only Tesla has meaningful, ongoing product enhancements and updates to existing vehicles.
When you buy any new car that isn't a Tesla, expect that car to remain pretty much the same as the day you bought it.
We had to delay our purchase of a new Toyota specifically due to Android Auto. Hyundai and VW had it years ago, but we had to be patient. It did occur to me a few times whilst waiting that I could "hope" Toyota would release an update and we could buy a 2019 and "hope" what we wanted would materialize later. I don't trust Toyota or anyone for that matter to give you any more than what you see. That's why I had to test AA on my wife's 2020 HB before buying, I didn't even trust that AA might work despite saying it on the window sticker, as Toyota has been obtuse about AA on all of it's USA vehicles.
I do agree that Toyota could be more honest. I believe AA may be added later to non-AA Toyotas, but Toyota will drag you through the murkiness until it happens.