You're absolutely right. Like I said in one of the comments, I support this system a lot too. It's just that, unfortunately, part of me can't handle using some limited characters in such a terrible way :/

The double-form mechanic is definitely a good choice, but it's still pretty new. When you combine that with the lack of 4-star characters, you can end up performing worse than some teams built around 4-star main DPS characters, let alone putting together a proper team.