Yeah, that'd be a good idea. That said, it still wouldn't resolve the issue for names that are in-use despite not being approved (or foreign names).

I also live in a country with a centrally governed personal name list, but you can request exceptions, and there are people who were born before the list existed, so their names won't necessarily be on the list either. Immigrants can also retain their names during naturalization I believe, and there can be lots of other complications still. So the ability to sorta-kinda predict the proper declension is still useful.

Related: https://en.wikipedia.org/wiki/Naming_laws_in_China#Ma_Cheng