As for character development is the 'drunk girl' type. The Misako from evangelion enjoying her beer after a hot shower was a staple of the series, but then replicated over and over so many different anime shows.
Honestly Japanese people sometimes have cartoonish reactions but those are some that I've never seen. Not in Doramas or with real people. I also don't get the appeal of such reaction. I think long ago there was a campaign about that first taste of beer from a can and how amazing it felt that first sip.
I guess that's where the inspiration comes from having that long 'aaaaah' of enjoyment.
I got acquainted with the Misako archetype after my mobile game got a collab with evangelion, the skits were probably based on how live JP comedy works. If it still works, why fix what isn't broken? Western audience were probably not the first considered when mangakas wrote the script.