I am not sure if it is true still, but I remember "regular" workers in Japan do not have to file tax. They are deducted from their pays and that's it. I think that will similarly apply to a very large number of population.

I also never liked really to use accountants, as they basically ask the same questions that I have to collect myself. Might as well use an online tool. Especially if most of the "W"s are already at IRS/FRB why do I even have to send the copies of them again. Why don't they just give me the partially filed XML/JSON to me to finish it off.