It is harmless. But moving it to the inactive ingredients will still leave many of them without a decongestant and they’ll have to change all of their packaging/marketing. The other ingredients are usually for fever reduction or cough suppression. It would be a waste of their money to keep a useless ingredient.
I must be a placebo effect case lol. I use phenylephrine HCl and it seems to keep me clear usually. If I forget it I spend the entire day sniffling or completely clogged. Though it only works if I’m well hydrated, it will actually make it worse if not.