Yes, and I'd go a step further: OSes in general need a concept of a 'project' or 'task' or whatever, which a) cuts across apps and b) integrates deeply with windowing and spaces.

Multitasking and context switching has been increasing for years, instant messaging boosted them again, and agent-based workflows are only going to push further in that direction. The OS needs to support that, and it's not an app-level concern: I use the same apps in each of my tasks.

IDEs can help with this of course: they tend to have workspace/project primitives and can restore code and terminal contexts from those. But there's always a bunch of other connected stuff that can't be linked: web pages (some IDEs are starting to manage those too), agents which don't reside in the IDE, relevant chats with colleagues, project management apps and so on.

This is clearly an OS-level concern, not an app-level concern.

Some of the iPad experiments with alternative window organisation looked kind of promising, but they’re just not powerful or intuitive enough IMO.