I've noticed a very large uptick in these sort of requests recently and it's down right irritating because they normally come from the buyers that you have to open an UPI case for (at least mine have been). As a buyer, sometimes I'm excited to get items and say so in a note but I always try to leave enough time. Such as, if I pay for an item on Sunday or Monday, I just make a comment that it would be awesome to have it by the following weekend but no biggie if it's not possible.
I think eBay is wanting to put pressure on sellers to ship in similar time frames as
Amazon Prime (yes, I'm guilty of growing accustomed to the almost instant gratification lol) while not necessarily doing a good job of managing the buyers' expectations. Yes, there's the handling time & estimated delivery dates but I think it needs to be much more obvious than it is. It's scary how much buyers don't read.
Also combined with the problem that USPS tends to be faster shipping than UPS but doesn't offer nearly the same degree of protection for sellers.
Ok, end of rant.