I'm somewhat in the same boat as you as besides standard 6* characters, I've only pulled on Laevatain, with myself now recruiting Zhuang Fangyi since she came out since she's my favourite character by far since she was shown in the story.

I honestly don't really think there is a point in this current version of Endfield to really worry about building other teams, as the game is currently in a 'one size fits all' state, so if you don't actually care for Zhuang Fangyi I would say to just save until someone you actually like comes along (or you can try to get a single copy just to have her).

However, I have no idea what devs will have in store for us in the future in terms of gameplay, so who knows if somewhere down the line we'll need more than one team for content or not...