The issue with blaming WFH for the service issues faced in the public sector, namely civil service, is that it is such an oversimplification and doesn't even touch the true cause of the issues.
The reason there is backlogs is due to a variety of factors. One of them is a chronic lack of funding and staffing issues, but sure, blame the staff working from home for issues they didn't cause or create.
Getting people back into the office won't solve staffing or funding issues. In fact, it'd likely exacerbate the issues as people would leave and find employment with employers offering WFH. That's a reality the "back to office," crew refuse to accept.
So, essentially, it would be taking one benefit away from employees to punish them for issues they didn't cause.
People have a vision of the WFH "class" as if we're all middle-class, soy latte sipping, in our big, spacious gardens and that we're all incredibly privileged. That isn't the case for many-many who work from home are entry level IT people, call centre staff, office admins, people who are working minimum wage jobs and WFH enables them to save a bit of money on the commute.
But sure, let's punish those people because some people don't like WFH and want to ban it because they can't WFH so why should anyone else? Well, I'm sorry, Brenda, but when you signed up to be a nurse, did you think WFH would be part of the package?