I don't however think that this will solve spaces on MacOS, for the simple reason that opening new instances of apps is inconsistent and often doesn't behave how you'd expect it to once one more than one space is involved (in my experience, anecdotal).
I've come to peace with the fact that I will never be able to simultaneously experience the productivity of i3 and the necessary evil of MS Office/Illustrator on the same OS. The most important factor in my work is who I work with (rather than what I work with) so I'll remain on the latter train for now.