One factor that might bias these results are the type of setup that one has in the office compared to the home, primarily available space (i.e. spare bedrom) and office equipment (i.e. ergonomic chairs home/office & large/multiple computer monitors).

That actually isn't bad is it? Cut back 50% on office space for savings (or leave some extra for growth), and have both groups accommodated.

The follow-on repercussion is that the pendulum swings even further to open-seating hot desk arrangements.

While I think that's true, I work for a company that even normally has a lot of remote and mostly WFH employees. In general, people who come in more then X% of the time can still get an assigned spot. But--at least if space is tight--you'll need to hot desk if you just come in a day or two per week or less.