I completely agree. My DH worked from home over Covid as did most office based people, and this carried on even after lockdown, but on a more part-time ad-hoc basis. He will freely admit that as diligent as he is, and with the level of responsibility he had (a lot) he was nowhere near as productive. During Covid it was just sort of accepted that this would be the case, but after it, people seemed reluctant to work as hard as they previously had for the same substantial salary, even though they were saving a fortune by WFH.
He got the hump that when he'd need to speak to a colleague or a staff member urgently, they'd not answer the phone when they should have been at their laptops working. They'd always phone back an hour or so later with some flimsy excuse for why they were not able to speak at the time, but whatever they were doing, they were clearly not in a work meeting. These are all people on six figure salaries working to important deadlines. It's not the sort of 'rubber stamping' job where they have a set amount to do and as long as they get through it, it doesn't matter when in the day it's done. Other team members were in the office, and needed to be able to communicate with their colleagues in exactly the same way as if they were there in person, ie. spontaneously and immediately.
Or people would answer the phone but it was clear that they were not at home working, but in a shop/restaurant on the golf course or whatever. But they'd always volunteer some sort of 'sorry if it's noisy, I've just had to pop out to the chemist for some paracetamol for a headache' or some such nonsense. Or people would clearly be dealing with their children. Sorry but if you are supposed to be working you can't be doing your own full time childcare at the same time. It might work for some roles but it really doesn't for others.
He found it frustrating to no longer be able to just stick his head into someone's office or pigeonhole and get an immediate solution to a problem or answer to a question, instead constantly having to schedule calls ahead of time, and chasing people to get the answers to relatively small things which stopped him moving ahead with something important. It wasted do much time and really impacted negatively on productivity. It also really affected the ability of his staff to work as a team and think as a team.
We've had a few experiences, since running our own business, where it's clear we are dealing with WFH people and it's incredibly frustrating trying to get anything done because of it. They just aren't available or responsive 95% of the time. Trying to get anyone to pick up the phone AT ALL or even answer an email in a reasonable time frame seems too big of an ask these days. Particularly when dealing with the local council. And yet there the city hall is, huge, imposing, expensive to run, and mostly empty. Just baffling.
We went in in person once because we were tired of not being able to get anyone to answer the phone. We'd left email and phone messages for the required department several times but never got a response. There was a woman sitting at a reception desk whose sole purpose it was to tell people that they could not see or speak to anyone in person, they couldn't make an appointment to do so either, and they should use the phone or email. Like we hadn't already thought of that, tried it a hundred times and failed.