1) The lack of privacy
2) Being location tracked
3) The expectation that one should be available for work communications 24/7 for no extra pay
I'm sure he would say something like "Wow, it's too bad America is no longer a free country. We programmers are building the systems that enslave us. We're building our own cages, without asking if we should. In the future out employers will prioritize themselves over our families, partners, children and mental health. What do your kids have to say about this?"
We all dismissed the idea of unions because we were highly paid salaried professionals that employers bent over backwards for, but come to find out, unions are more than about money.