Yes, there are hundreds of millions of professionals who need a computer for their work, while not being techies. They write and publish, do spreadsheets, edit photos and videos, make music, make invoices, read and send e-mails and so on.

It's like asking why a non-mechanic would ever need to use a car.

I did mention IT at offices buying computers for their coworkers. :-)

I know more and more people who are editing photos and videos on their phone/tablet - not movie producers, sure. But lots of YouTubers, influencers, etc.