Sure it could, it had cooperative multitasking. Inside Macintosh instructed programmers on the importance of politely giving way to other processes.

https://archive.org/details/inside-macintosh-1992-1994/1992-...

WaitNextEvent (hmm, a Windows call has the same name, but functions differently I think).

It is, that is why there is preemptive multitasking and non-preemptive multitasking.