Personally, I haven't seen many good arguments that WFH produces superior work outcomes. Companies are collaborative human endeavors. Most WFH arguments I hear are related to personal fulfillment: more time with kids, less time commuting, more time for hobbies, etc. Those are all great things, but have little to do with productivity. The closest work-related argument I've heard is that some people work better when they're free of distractions at the office. That takes us back to companies being collaborative human endeavors. One may feel they work better in isolation, but part of ones job is to interact with others, even if that's not fun.
I don't want this to sound judgemental. There is no requirement that people organize their life around what's best for the company they work for. It's totally fine to enjoy working from home. But I don't see the argument that WFH is better than WFO for most companies, even if it's often better for the individual employees at those companies.
I think we'll get more conclusive data when WFH is and is not appropriate.