That's a really, really poor response @Designless and very snipy.
You sound as if you're willing to defend WFH no matter what evidence anyone presents to you.
Why is it that at my daughter's cancer hospital (Yes, outing), the receptionist for one of the specialist units has a voicemail which says
"sorry, sometimes I am working from home. I will occasionally check messages and get back to you"
Which is essentially a licence to say "when I'm at home, this number doesn't forward, which means you don't have a receptionist, you have an inbox".
Is that also ok for me to point out, or would your snippy reply be
"well go private then, or maybe you should bring the cancer treatment in-house" etc 😃
Not everything about WFH can be defended, you'd do well to accept that there are people out there who are taking the mick, and that's just factual.