Discrete event simulations is used to get better utilization of a constrained resource. The fact that hospitals were using it just reinforces that ICU capacity was considered a serious constraint by policymakers. Discrete event simulation will give policy makers more confidence in capacity models but doesn’t improve patient outcomes or reduce treatment time.

Hospital protocols also improved over time to reduce the need for respirators and the disease moderated but there was no magic protocol that really reduced disease progression or duration. Out of my social circle there were anti-vaxers that contracted covid late in the pandemic and spent weeks in the hospital (four total, two deaths) even with late stage protocols.