I feel for the guy. Sad thing is, the people refusing to use a powerful and efficient piece of software because they can't click or swipe will be suffering and wondering why their job is miserable. And the customers standing in the queue will be suffering too - especially the ones who've seen efficient POS software being used in other shops.
And as an aside the best and fastest POS I ever used was a DOS-based system. I ;earned to key on the number pad because of it (now I need any external keyboard I use to have one). We actually got so good we could key up entire processes, invoices before the screens could update! This was pre-iPhone/touchscreens everywhere and I thought it looked old and outdated when I started. My appreciation grew after working with it, though.
If you find me being less than pleasant on this site, it's usually because I'm talking to someone who is making me feel this way. It's like the modern technology landscape has somehow forgotten the wisdom that was built up over generations. It's infuriating.