I used to work at an international airport. Once, when a plane arrived they discovered that one of the passengers had likely died of natural causes before landing. They had him removed and the doctor obliged by declaring him dead on the jet bridge, rather than on the plane.
Apparently, if a passenger is declared dead on the plane, they have to do a thorough clean. This would have caused a delay. Delays cost money. Thanks to him officially having died on the jet bridge, no thorough clean was required. The cleaning staff removed the excess rubbish, and some lucky passenger unknowingly got to fly in the dead passenger's seat less than half an hour later.
I suppose I should have been more appalled, but this happened for a low cost airline. I never felt too much sympathy for passengers who paid significantly less for their flight, often a flight that could have been a train ride that didn't kill the planet, invariably treated ground staff like shit, then complained when the budget airline offered them budget service.
Not that the business class passengers were much better. Like the VIP who deliberately shoved a pregnant colleague with his trolley, but wasn't banned from BA, because he was a gold member or something stupid like that.
See also: Third Culture Kid and articles about how language influences personality.
When you're from country A, but move to country B, you don't feel at home in country B. But when you return to country A, you also don't feel entirely home in country A. You have a slightly different accent, have had different experiences, likely developed different cultural mannerisms, habits, etc. etc. .... You're perpetually stuck between cultures, hence Third Culture Kid(TCK). Especially true of children who move at a young age. So much so that, if they read a book about TCKs, they soon realise that what they thought were unique personality quirks, strengths or character flaws. are anything but unique among fellow TCKs. Also true for adults but to a lesser degree. Also true for people who moved larger distances within a country, changed schools a lot, etc.
A bit like returning from a holiday and finding things have subtly changed, if you stay away long enough you'll likely never feel entirely at home again. The country you knew no longer exists, you're no longer the same, you notice it's not the same, and people notice you're not the same.
Of course, in some ways nostalgia is similar. Nostalgia is homesickness for a place that existed in the past. Like waking up one morning and discovering someone rearranged all the cutlery, it can make you feel perpetually discombobulated.
Unfortunately/fortunately, there's no way to stop time, and Make the World Like it was Again. Not that populists and advertisers won't try to sell you on that lie.