The degree to which it is enforced, managers being required to enforce the policy, and to which compliance is used as a measure in performance reviews have all increased and, as you mention, some teams have gone to 4 days with pressure to exceed the minimum three days. At least one person I've spoken with indicated that their promotion was delayed until they could get their RTO compliance numbers up.

Ah gotcha. That is somewhat unfortunate (or at least it would be for me) that promotions are tied to in-office days.