That's how computers and software work by default. It's an entirely different business philosophy. We can gain more market share but having a just works software environment for as many people as possible VS we can resell people the same software over and over again.

You're impressed that they managed to fill their diaper for so long without any leaks? Linux can read the oldest unix file, compile and run the oldest programs. Their "backwards compatability" is entirely a self created problem, they realized they can capture more value, in the short term, if users only see a binary so they have to implement a technically flawed solution.