Or the opposite - companies with the most draconian and rigid RTO mandates end up with high attrition. Anyone who can work anywhere else does so, and the company becomes a collection of misfits over time.
Currently the hard-RTO companies in the news are clearly doing it for silent layoffs reasons as there are simultaneous leaks of 5-figure attrition targets.
Maybe a strong FTC/DOJ stance on antitrust, plus the top-down mandates will lead to more small company innovation as well.