Only Java is unstable because it’s not following Apple’s rules. Everything else, including the apps that follow the rules, are stable. That’s how it’s always been for the Apple ecosystem.
Java is not breaking any rules. macOS has memory management provisions for JITs and virtual machines just like every other OS. SIGSEGV has been part of Unix for decades and works perfectly fine on other OSes. And still works "most of the time" on macOS. Apple broke something here, and I'm sure they will fix it pretty soon.