Yep, to some degree at least. Even some more modern systems after that had some similar problems, where there was less or no direct interaction anymore and user

Yep, to some degree at least. Even some more modern systems after that had some similar problems, where there was less or no direct interaction anymore and userspace and kernelspace was the 'best' boundary there was to offer. But the same problems still persisted within the space if the other one goes down. Imagine having a fully functional app but you still can't do anything because the service 'on the other side' doesn't work. It's better because it won't crash the entire system, but it's the same because you still can't do the work you intended to do...