I fully agree with your insights on the homeliness of semi-public spaces, as well as your fascination with hotels. They exist as an intersection for so many different lives and stories, bringing people together with one of the few things everyone has in common: the need to sleep. There are not many places that, within 10 minutes of arrival, can make people comfortable enough to sit in the lobby with sweatpants on, doing homework while munching on cookies/popcorn and drinking hot chocolate (my typical night while traveling for sailing). Hotels have that magical ability to make you feel at home the second you step in the front door.
I look forward to reading more of your observations!