If a company claims they're data driven, then they should use data to make choices.
In this case, they'd need to look at the cost. "will my employees being in office perform so much better despite having to drive through an hour of traffic?" I'm not sure how you'd go about this one.
"Will increasing risk of becoming sick be worth the extra productivity increase, assuming there is one?" If there's a 10% increase in getting sick, and the median number of sick days per year is 5, then will 0.5 more days of being sick for every employee be a justifiable cost?
RTO also has all the costs associated with office space, employees to manage those facilities as well. I always hear that building costs are miniscule in the grand scheme of the business, but I never hear the number as a percent of overall costs.
At the end of the day, some attempt to justify the decision beyond "collaboration" is what I personally want. I don't think putting a bunch of introverts in a room together is going to suddenly increase socializing.