Agreed, I'm planning on paying myself 2.4m thb and that gives a tax rate of about 22%. I'm OK with that.
Would pay myself more and the Thai gov would get more money if it was a flat 17%, but I don't consider paying upwards of 25% tax a deal for what you get here.
But if they make this worldwide income thing, then they'll get 0 from me and by just talking about it they've made me consider backup plans that may take me away from paying any tax to them even if it never comes in.