I’m familiar with postal services both in Poland and Japan and I like the Japanese solution even more - most of the new buildings have package lockers operated by the building owner and independent from the delivery service. Everyone could put the packages there and my building would notify me about a waiting package when I entered.
That's actually rad, but... it's not that different from making current mailboxes bigger. In PL in large buildings those are on ground floor, next to each other. If you make them bigger you only need to add notifications to match that.
DPP-4 drugs are less effective also on other metrics. Would be far more interesting to see the comparison of SGLT-2 inhibitors vs GLP-1 agonists.
For some reason GLP-1 drugs are not that popular in Korea (and still not prescribed just for the weight loss), so that may explain why these researchers haven't done that.
From experience of traveling to many countries and talking with people about food - not everyone is interested in it. I've heard many bad recommendations or people surprised I know the dishes they have never tried. And that's okay.