My experience is totally to the contrary. That American software is overpromoted crap - see you there Salesforce.
I have an (admittedly) older BMW. It just works. At first I thought that the cruise control lever is worse than buttons on the weel. After spending a lot of time in the car - no it isn't, it's much better.
> Does the vast majority of people do more than one thing on their computer at a time?
Absolutely. Just looking at my wife, an office worker. Even when not working with whichever of 5 huge Excel files she has open, she is talking on Teams while working in a permanently open Outlook. Add a variety of internal sites which she constantly peruses. She just cannot have each single application taking the whole screen at a time.
and they will gradually get complicated tasks
actually sounds like a trainee