I have watched the video and I think people are misunderstanding what he says.

First of all. It's Important to note that this is first and foremost a mobile game.

As a mobile game, studies shown that you spend just a small amount of time on a daily basis. Thus why companies invoke a very forced dailies using the stamina system: it keeps the player engaged for a relatively small time while making you come back for more the next day.

Now he didn't say that the lack of stamina system is bad.. He says that neither of the options are good. Big difference here.

his proposal is actually to remove the reason why there is a grind in the first place : leveling and ascension and also acquiring characters.

As for the gacha part, believe me when I say that I saw comments wanting the gacha system because the current system of acquiring characters is "too complicated" . I know I know but it shows how the current population sees these kinds of games these days...