The US is not a county optimized to provide quality services inexpensively. It is a business optimized to maximize profits.
https://www.irs.gov/e-file-providers/free-file-fillable-form...
As for "having most of your tax information", they don't. They know your reported income. You see that on your W2s/1099s/etc. What they don't know is whether or not you had a kid this year, or whether you lost a kid this year, whether you got married or divorced, if your spouse is claiming the kids this year or not, the number or amount of your charitable contributions, whether you have deductible mileage expenses, or a million other things.
Would just relying on the information from your employers cover all possible edge-cases? No.
Would it dramatically simplify the process for (tens?) millions of people? Absolutely.
No? 2 more clicks and you are done.
Yes? 2 + nr of changes clicks and you are done. Took me an extra 5 seconds when my son left.
You can make your taxes as complcated as you want but for 95% of the population foling taxes takes a few minutes.
Another factor most people are ignoring is that state taxes are filed at the same time and each state has its own separate system. These third parties let you fill in and file both at the same time. It would be nice if the US gov did this too but it requires a total restructuring of the American system, and Intuit’s lobbying has nothing to do with why it hasn’t happened or for that matter why the tax codes looks like it does.
Countries like the U.S., Canada, the U.K. cannot easily do that without huge data-sharing reforms.
IRS should just have a public free filing solution for everyone. If you have complicated taxes or want to do your own filing, you can still do that.
