Because Intuit Turbotax lobbyists take congressmembers out on their yachts, and our representatives aren't interested in saving the country's citizens money
I think it's more like that 50% of representatives think that taxes shouldn't exist, so by making taxes an annual pain point, they are increasing their own support. "If it wasn't for That Other Party we wouldn't have you paying $39 to Intuit every year, but that's all they do, subsidize Big Tech with your Personal Information."