If someone’s productivity slips from wfh then address the issue sure.
There's absolutely nothing wrong with that. That's what I've been strongly advocating for during the last 2 years. Go out there and live your life normally as you see fit.
One problem is that at least some people out there are trying to milk Covid-19. Publicly, they tell their employer they're too scared of Covid-19 to come to the office so they get to stay home. Privately, they go out every weekend and interact with people normally and live their life.