Still blows my mind that Americans have to do this.
In the UK almost nobody needs to "file their takes" and if you do you just do it online without the need for software.
A lot of people in the UK file their taxes (~12 million, roughly 35% of employed adults, not taking into account those unemployed with assets and pensions), but the self assessment is straightforward and very easy to use.
Until you have to deal with bed and breakfast rules for RSUs. Good luck getting free software to understand that. There are a couple of open source attempts but they are skeleton at best.
Maybe its because in the UK, you are basically just giving all of your money to the government so there is nothing to work out.
Would you prefer to pay $100 for software, or a 50% marginal tax on a meager £100K?