I shouldn't have called the home energy thing a "deduction." It is a credit. And in 2021, some amount of charitable contributions could be claimed on top of the standard deduction.
"This isn't hard" -- as illustrated by both my and your mistake, this is as far from the truth as could be. Everything related to taxes is absurdly hard, whether it's setting up the right tax prep system, the right level of complexity in the tax law, or simply the right return to file as a taxpayer. My overarching point here is that Congress made a certain value judgment as to one of these very hard problems—that a healthy industry dedicated to getting people's tax returns correct might be in the best interests of both the government and taxpayers—and this might not actually be the product of corruption.