Patch 7.04 was famous for its relatively balanced hero pool (by non-competitive standards). You had fan favorites:
Historically, the most famous "Dota AI" was the OpenAI Five project, which defeated world champion players. However, that AI was never released as a playable public patch for casual games. 🛡️ Recommendation dota 7.04 ai
While the paper was published in late 2019, it documents the multi-year development of OpenAI Five Patch 7