I believe that in theory. But I've tried Mixtral and Copilot (I believe based on ChatGPT) on some test items (e.g., "respond to this..." and "write an email listing this..." type queries) and maybe it's unique to my job, but what it spits out would take more work to revise than it would take to write from scratch to get to the same quality level.
It's better than the bottom 20% of communicators, but most professionals are above that threshold, so the drop in quality is very apparent. Maybe we're talking about different sample sets.