Companies that don't allow partial WFH confuse me. All my employers, even before the pandemic, have allowed ad-hoc WFH whenever. It worked fine. If the team had a meeting or day where we all needed to be in we just said so and worked around anyone who had to WFH at certain times or days. There was never any official policy, people were just trusted to be sensible. Got a GP or dentist appointment near home, just WFH. Feeling under the weather but not so bad that you take a sick day, WFH. Need a day to focus, WFH. Hell if you know you're going to have a hangover, WFH (you never said so but it was an open secret and no one cared so long as the work got done). It was great and I can't see any downside to it at all.