It’s been a while since I tried it (maybe 2018?), but Python 3 support straight up didn’t work despite the documentation. It also seemed like adding support for your own toolchain required you to write Java plugins in a very confusing, inheritance-for-it’s-own-sake, raptly-2000s-OOP way.
Got it. I can relate: while Python 3 support is probably fixed now, I agree that Bazel tooling for adding toolchains has been always abysmal. Things somewhat get better (https://docs.bazel.build/versions/master/toolchains.html) since it's now in Skylark, not in Java, but I still don't like it (aka not productive)
Overall, custom toolchains are common (especially, in the embedded world), and a good build system should make that very easy.
