With most states dropping mask mandates (and other restrictions) and lots of school following suit but sometimes without giving clear reasons why, I was thinking about it, and it likely comes down to the following 3 (everybody got omicron, boosted people are doing well still, and fatigue):
1) With how fast and widely omicron spread, it bit into some of the rationale for universal masking, given the main purpose of masks are to limit spread. It also bit into the rationale for restrictions, since 30-40% of the population got covid over a month. Even the most careful people like epidemiologists who had avoided restaurants and planes got omicron.
2) The IFR is approaching that of seasonal flu, especially if you're vaxxed. Despite covid mutating heavily into delta and omicron, boosted people fared remarkably well. This undercuts a lot of the "what about new variants" arguments, although yes, the space of possible mutations is nearly infinite and anything is possible (and it's also possible we get a completely new, unrelated virus that is more deadly, but that could happen in 3 months or in 100 years).
3) People are a bit fatigued -- it's been two years now. I'm not talking about anti-maskers and anti-vaxxers even. I'll much more happily put a mask back on if we get another surge this fall rather than wear a mask continuously for the next year regardless of whether cases are at 10/100k (as they are now in NYC) or 500/100k (as they were 2 months ago). I know people criticized the removal of the mask mandate last summer (which lasted 2 months), but I was ok with it, and I'm ok with it now. Transmission has tended to be lowest in the spring and much of the summer, so if there's any time to do it, it's now.
Caveats: these statement apply generally. There are specific cases where these may not be good rationale, and this may end up backfiring. But I'm just trying to understand the logic from many people in leadership positions who have been pretty conservative w.r.t. covid and suddenly, at least at first blush, appear to be changing course.