[toyg]

> Current latest java still runs 20 year old jars.

Dude, I've been using Java since 1.2. Sure, all versions will try to "run" anything, but they'll do that with all sorts of slight differences and incompatibilities in behaviour - which make it effectively impractical for any serious program to run on anything but a small subset of tried and tested versions.

> The OS distributor

Careful what you wish for. Do you really want to hand Microsoft the power to decide which runtimes are allowed to run on Windows...?