What's the reason that a non-monk character can't use the second fist as a bonus action when it can already use that bonus action for any light weapon?
If you could use both fist, you still deal less damage than a monk…
— Moses Lord (@MosesLord777) April 17, 2020
The 2-weapon bonus action on page 195 of the Player’s Handbook is a special action for weapons that have the light property. It has no other purpose. It’s not trying to model two-handed fighting of any other sort. Other features in the game do that better. #DnD https://t.co/pRuSlgGZgq
— Jeremy Crawford (@JeremyECrawford) April 18, 2020