AOE2, 3 and 4 have lots of tournaments, some of them with quite decent prize pools.[3]
I personally don’t play AOM so I can’t comment on that but as far as I have seen, Microsoft has done a good job at reviving the other games and with the new game so while I don’t doubt AOM is buggy I do have faith they are actively attempting to fix issues.
As for the Windows only thing, as I said, I use windows at times myself and I don’t mind paying for proprietary software. But I understand if others have qualms about that.
But to say that the Age of Empires series died with AOE3 is untrue, and while 0AD is a great achievement, to say it is a replacement for the actual Age games is also not true.
Also note that MS did reimplement the engine for the AOEI definitive edition, unsure about the others.
1 https://en.wikipedia.org/wiki/Age_of_Empires_IV 2 https://www.ageofempires.com/news/age-of-empires-iv-season-f... 3 https://liquipedia.net/ageofempires/Main_Page