I don't think there's a one size fits all to WFH. It's going to suit some more than others. If you have an ideal home set up in a house that is empty most of time and are mentally resilient to long periods of isolation then it can be preferable to commuting and possibly more productive depending on what your job is.
I feel for most people a flexible/hybrid approach will be better longer time. Lose the culture of presentee-ism, lose less employee time to sickness and childcare emergencies e.g you can feel too unwell to face the commute but maybe well enough to work a short day on the sofa from your laptop. Bonus being less germs spread around the office by people who drag themselves in with a nasty cold bug.
There are less than ideal scenarios too though. I feel a lot of employers are not considering how their policies affect non employees e.g. the other people who live in the house with the WFH person.
I do have a bit of an issue long term (the pandemic has been an exception where we all have to pull together) with a large corporation I personally don't work for basically acquiring part of my home as an arm of their business because they could save themselves a lot of money (more profit) by closing office space.
I think eventually employers who expect full time WFH will start to be challenged on this aspect and also the associated costs such as an employee needing to kit out a home office, build an extension/loft conversion, having to upgrade to super WIFI for bandwidth, increase in utility costs. All these at the minute are being passed from the employer to the worker. It's an aspect I would like to see Labour MPs and unions challenging.
On a related note, about 10 or so years back when WFH was a much more radical concept BT (the Business and IT services division) ran a long pilot into home working because they foresaw it could be a useful thing with cost saving implications. It ended up being scrapped and not rolled out to the wider company because it was found to be having an adverse affect on employees mental health.