It’s continuing existence is their fault, then. If not their sole fault.
You're missing the feature where your information is carried over year to year and all the forms you get can be automatically parsed. "Doing your taxes" with current software can be as simple as uploading a few PDFs and clicking next a bunch of times.
The only way to simplify taxes is to actually remove deductions.
My deductions were usually only around ~$17,000 with pretty decent charitable contributions, I don't even have to think about if I'm going to itemized this year. I suspect I'm a pretty "average" itemizer.
There's a middle ground with upper middle incomes and small businesses which have somewhat reasonably nontrivial tax code that applies. In the absence of software they would probably be pushed the accountant route. Generally people want this complexity because they pay less compared to proposed simpler systems.
Intuit lobbys to stop this happening because they know a lot of people don't have complex returns and if the government automatically calculates basic returns it would wipe out a large portion of their customer base.
https://www.propublica.org/article/filing-taxes-could-be-fre...