I feel like every word in the title is deceptive: Someone you're renting a room from is not a "stranger", nor is their renting it to you "generosity", nor are you simply "getting by". "Enjoying the hospitality of small guesthouses and private hosts" would be much more accurate.
Im wondering if tourism isnt a net negative? The tourism industry thrives which means people move to that industry, then that industry becomes so big that politicians say the country can’t survive without it, then the culture vanishes . See the coffee shops in Shibuya with majority tourists, their manner is completely different.
One consequence of "Japanese hospitality" being widely known is that there are now swathes of tourists visiting with the expectation of getting their own "magical experience".
Some people living in places that have become tourist areas are putting up signs announcing their home toilets are not for public use. Because apparently some tourists have said things like "When I needed to use the bathroom and there was nowhere else around, I knocked on a random person's door and they were kind enough to let me use it!" So now a non-zero number of people go there with the expectation that they can (and possibly should) do the same.
Tourists used to be a novelty to Japanese. Now with over 40 million projected for this year, a massive rise from about 6 million in 2012, a large number of them taking extended vacations (in contrast to Euros who might hop a border for a weekend and boost tourist counts quickly), people are getting quickly burnt out with the entitlement many of them exhibit. To tourists, it's a magical, unique vacation and they must have the Ghibli experience someone else posted about. To locals, countless people are harassing you everyday demanding unreasonable things.