WFH increases productivity
I WFH one or two days a week and on those days I get between 50 and 100% more actual work done than when in the office. To be fair, in the office I am also mentoring newer staff but the constant distractions and interruptions have a HUGE effect on my productivity. I have pointed out my increase in productivity and my managers agree that me WFH is good for me, the company, and our customers.
Now if you have people WFH who are slacking or being less productive, then that is a management failure. What you managers need to do is remove the right to WFH **for that individual** rather than punish everyone for the laziness/screwups of one of a few people.