Personally, I would use Roblox’s terrain grass because as you said it is easily customizable and you can even bring an extra realism wind effect to it without the need of using plugins for that.
Ah didn’t see that lol, I found it easily customizable because there is a useful property that allows you to change the color of the grass and that it comes with the wind effect I mentioned before.
Oh yeah I would see how that would make it seem a little off.
Some anime styled games though have like a bit of grass movement and similar grass style to Roblox a bit like Genshin Impact. But I guess it really just matters style your game is first.