More information available at once, more fine user control, less chance of fucking up. If you're going to be spending big, at least make sure what you're doing is the thing you wanted. Desktop sites are still superior in that regard. Until the mobile-first trend turns everything into an enshittified mess, that's the way I'll keep doing things.
I didn't even realize there were other possibilities. Certain tasks require a laptop... until one day I saw a friend working on a spreadsheet on his phone! He said he was too lazy to work on the spreadsheet on his laptop. These people exist?!