The flat tax rate would be much less, of course. Instead of taxing me 50% and a bunch of deductions, tax me a flat 25%. I'll take the deal, and the IRS gets to not have to read five hundred pages of crypto transactions.
What part of your revenue is taxable? Can you defer some of that revenue? Is it revenue?
Are flat taxes fair to all levels of society? Does a billionaire paying 25% hurt just as much as a single mother working minimum wage (the consensus for the longest time has been no, and why we have progressive tax brackets).
I can go on. Current status quo is not great, but it’s the best bad option we have, IMO