All the Linux kernel development work is organized around a mailing list, and some private IRC chats for the core people. It's the technology of the nineties but it works for them.

A lot of corporate stuff seems to be much worse than even a random vibe coded web app. I have to book holiday through something called "HR Connect", watching pages load laboriously and redirect every login through several very long URLs. Slowly.

The Linux kernel development work isn’t a corporation

Yes, the Linux kernel people can be trusted to manage their own machines. Random corp employees cannot. Also corp machines are corp property, not the employees own. If you have 1000 or 10,000 machines you need to manage them. Full stop.

Yes, many corporate websites are bad. Like ERP or HR systems. None of that has to do with device management, RMMs/MDMs or Intune.