1) "it will just compile and run programs with incompatible version dependencies and then they crash at some point"

2) "Now a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?"

You can't solve both of these simultaneously.

If you want a library's dependences to be updated to versions other than the original library author wanted to use (e.g. because that library is unmaintained) then you're going to get those incompatibilities and crashes.

I think it's reasonable to be able to override dependencies (e.g. if something is unmaintained) but you have to accept there are going to be surprises and be prepared to solve them, which might be a bit painful, but necessary.

Yeah, you have to bump stuff and use packages that are actually compatible. Like Rust. Which does not do the insane things that Maven does, that the post author is presumably advocating for.