I have zero knowledge of the technical issues with the USB but let me propose a rather snide reason....not allowing removable devices prevents bootlegging of the software. I had a problem with TT not recognizing the key for 2019 file to import into 2020 - fortunately I never trust software and always have printed copies. Not a biggie to hand-enter the important items. Hence the key was annoying but a non-starter for me. I also discovered this year (2020) that TT hates my wireless mouse (USB dongle). So I disconnected it, plugged in a wired USB mouse, things are good.
More aggravating than anything else I was forced to upgrade the OS on my Mac. Obviously the developers at Intuit have super-high speed networks but on my slow DSL, this is a 6-8 hour download!!!! More than once, too, due to network problems. Absolutely unacceptable.
Three more reasons I'll be looking at HR Block next year.
