I'm in the middle of a large project at home. I've made probably 10-15 orders from Amazon in the past six weeks as I find my way through it. All but two of them arrived within 3 days, despite most showing weeks out. No difference in shipper, shipping tier or anything else that I could see. Of the two outliers, one arrived within the estimated time and the other was lost in shipping.
But also I think they’re using it as an excuse to use cheaper shipping. I know bestbuy is doing this for sure.
I think they figure no one will notice they’re using smartpost and if you complain just blaming the speed on the pandemic.