People seem to like to do things on suboptimal devices. I've never quite understood it. Just the thought of wasting time not being able to use a mouse and keyboard makes 99% of tasks unbearable. But it's almost like you don't know what you don't know.
My 6 year old was playing Minecraft on a tablet / console for a long time before moving to the computer. He's said several times about how much better he is at it on desktop. I've never even mentioned to him that one's technically better than the other.
I don't know if mobile tax apps do this, but if they did I can totally imagine mobile being far easier for most people: Use your phone's camera to take a picture of your W-2, use OCR to extract the data & confirm with the user, ask the user a few questions for things not on the W-2, autofill the 1040.
My 6 year old was playing Minecraft on a tablet / console for a long time before moving to the computer. He's said several times about how much better he is at it on desktop. I've never even mentioned to him that one's technically better than the other.