Not now, not most of the time anyway. I did say mostly fixed
That was not the case back with Java 6 ish. Even massive breakage between minor releases was common. you had to tell everybody exactly which jre to use and possibly ship it with your software
Same. And the best car at hand is the EV one, 100pct of the time. Whoever goes out takes that car. In the off chance the second person need to go out at the same time, they take the older crappy car.