No but you have to pick where and how quickly to ramp the tax schedule which will eventually lead to you having to make some “assumptions” about what size (range) is “too big”
Everywhere.
and how quickly to ramp
Yes, that is the one and only tuneable variable. It's a single, obvious scalar, like the interest rate set by a central bank. There's no room for favoritism or shenanighans. Of course, like central bank interest rates, it will be an object of impassioned political debate. That's expected.
which will eventually lead to you having to make some “assumptions” about what size (range) is “too big”
Absolutely false. You're confusing a value with its rate of change. The speed limit on the highway doesn't constrain the length of the road.