And on many more you can not. It's getting increasingly difficult with that shitload of devices being on the market which while being so similar are so differen

And on many more you can not. It's getting increasingly difficult with that shitload of devices being on the market which while being so similar are so different. Even if you try to buy with that in mind and explicitly choose a well supported one there is no guarantee this holds true after some years. Either the next Android version breaks a lot of things or the handful of people who do the work loose interest or time to do it, often both.