Better say, the older games were balanced about both aspects from the beginning. Tournaments always were part of AoE which is why Microsoft sponsored a 100k tournament for AoE 2 back in 2001 and pro players like Daut or Capoch are active for over 20 years now.
Also, for an esports title, AoE 4 is missing basic features the older games have, such as sharable replays.
Regarding the AI - I also made a topic back in August: