But the Unix environment is written in C, and there's a ton of legacy from the past several decades still to migrate from C. It's going to be slow going. That said, ditching sudo seems like the right thing to do, but then, writing a drop-in replacement is non-trivial too because sudo/sudoers is so baroque -- yet w/o a non-drop-in replacement would require user/customer migrations.

Meanwhile RedHat and others don't have infinite resources, and they inherited sudo.