Spare the turn signal, esp at four-way stops, now in effect indefinitely

Mid-peninsula, checking in. Has anyone noticed that drivers have stopped bothering with turn signals, especially at busy intersections where road communication might just save a shitty thing from happening? It used to mostly be the big dick trucks, cool guy cars, manic gig workers, and work trucks running late to appointments, but, for the last two months, it feels like it's spreading to the rest of us.