That's how you make people lose interest in the country — exactly what OP is complaining about. If you want to stop brain and capital drain, taxation should be the last thing on your mind.
There's a tipping point though, right? I think the right question is, how do we find the correct threshold?
Otherwise, there will be an asymmetry in which the "brains and capital" will get all the benefits of taxes with little to no skin in the game. That implies society serves the economy and not the other way around.
Otherwise, there will be an asymmetry in which the "brains and capital" will get all the benefits of taxes with little to no skin in the game. That implies society serves the economy and not the other way around.