I don't buy Early Access products anymore because I usually get fed up of the game while playing the incomplete version and never touch the finished product so I just wait for the complete experience so having the game launch early on Epic for me works like an extended beta test and I pick the complete game 1 year later on Steam.
However, with Epic money already on the purses and the financial success of the game all but warranted I feel some companies lose their teeth.
I'm not saying depending on having the pressure of launch to be successful or even to survive as a company is healthy but it is seen to sometimes keep people focused.
By the way, this is NOT the case of Hades but I think it IS what happened with Phoenix Point.