Ever heard of Turbo Tax? If I can do it in 2 hours each and every year a day before the deadline being US citizen in Poland, yeah you need a lot of bad faith to have issues.
In the UK I do my taxes in 0 minutes most years, maybe in 10 minutes if I get a small return through the post.
Fwiw (I didn't use turbotax but some other online software) when I did my last US tax return; it was wrong and I had letters come through adjusting the calculations.