What are the downsides of pursuing US-Taiwan dual citizenship?

Not sure where to put this, but it seems related, so I’ll put it here.

If you have a Taiwan passport (either NWOHR or with HHR), and another non-Taiwan passport, is it mandatory for you always to enter Taiwan with your Taiwan passport?

I suppose that once you have HHR and full citizen rights/responsibilities, you are supposed to always enter on your Taiwan passport.

But how about if you only have a NWOHR passport, plus another passport? Are you still required always to use your NWOHR passport when you enter Taiwan? Or can you use another passport? Not that there would be any benefits to doing it either way, but I just wanted to understand the law.