And that's not even getting into the S-corp self-employment-tax dodge.
I thought that's mostly the point of the standard or itemized deduction (which businesses don't and shouldn't get).
For two, the standard deduction is better seen as a personal exemption (which it subsumed), giving everyone a level of income that they don't have to pay tax on. Especially given that business expenses generally flow through as direct subtractions regardless of the standard deduction.
There is definitely tension between allowing deductions to account for actual income fairly, and the resulting (de facto) requirement that everyone do minutiae accounting for their personal finances.
We were so close to losing the cap on SALT deductions with the Inflation Reduction Act; I'm super bummed it didn't make it into the final bill.