When I started out preparing tax returns, they were prepared by hand.  That meant that we had to understand how the numbers flowed through the various forms and schedules.  We even had to do the tax calculations ourselves ——- no buttons to push to get an answer.  It’s sad to say that a large number of tax preparers starting out today aren’t tax preparers but are instead data entry clerks.  The data gets entered and they have no clue if the numbers are correct but if the software spit out those results, they believe the tax return has to be correct.  They aren’t capable of following the flow of numbers through a tax return.  I really have no clue why people pay good money for that service when they are quite capable of screwing up their own tax return using Turdddotaxxx.