That complaint doesn't quite make sense to me because things like "language servers for every programming language in existence" don't exist for iOS in the first place, even if you were allowed to run external processes.

To me the logical solution is something like Replit, where your arbitrary programming environment is running off-device. You want to program Go or Python on your iPad? Okay, but the actual code is executing in some cloud machine. Apple should be happy with that, and it'll be a lot easier to maintain all this stuff off-device anyway, than on iPads, where nobody else is maintaining a toolchain.

Of course that doesn't work with a "one-time-purchase" business model....