Well, lockdowns have ended in most places. Even in Michigan, which had the last big spike in the U.S. (so far), the governor decided not to use a lockdown. Now this may have been primarily because it didn't appear to have had much beneficial impact; this is further supported by the fact that Michigan's last spike ended just as quickly as the prior ones when there were lockdowns. However, it may be that the impact on mental health had some influence over the governor's decision.

Our society hadn't really dealt with a pandemic of this size since 1919 (although that one was far bigger), and hadn't dealt with a pandemic of any significant size since 1968, so clearly we did some things wrong. It's kind of like a military which has not fought a war in decades; you can expect them to not be very good at strategy for the first year.

By the way, masks and "endless testing" do not cause anywhere remotely as much stress as lockdowns, I don't believe.