I guess those are runtimes just predating a fairly large breaking change (actually I know they are for C#, and I have a vague idea of what broke from Java 8 too

I guess those are runtimes just predating a fairly large breaking change (actually I know they are for C#, and I have a vague idea of what broke from Java 8 too). I think that updating from old version is prime AI work. It's not hard, usually. It's just a lot of boring, soul-sapping work, enough that if you set the famous 10x engineer to do it, they wouldn't be a 10x engineer by the end. Then again, maybe a super-engineer would do something wild like the Minecraft 1.8 modding community did... despite being a pile of code injection hacks into a famously messy codebase, chock full of reflection and classloader shenanigans, they actually found a way to run it on a newer version of Java than the official, latest version of Minecraft can run on.