Okay, that's fine as long as it also becomes illegal for local governments to shake down the well-off and their companies by voting to raise taxes on them.
What you say would make sense if you were suggesting some government was targeting specific well-off individuals. E.g. say Bellevue decided to institute the Bill Gates Tax which required Bill Gates to pay $1 million a year. But as you put it, you're basically arguing against any normal progressive tax scheme.
It should be illegal for them to raise taxes on one specific business or person and no one here (that I've seen) is arguing otherwise. Otherwise if you are saying the government should never be able to raise taxes as a whole then I don't really get how that's connected to the story