I don't doubt Swiss made stuff is much tighter and has better detailing than North American builder grade crap.
For the "leaks bugs" part - ladybugs here will find a way in as soon as you have a 1.5-2mm gap. They find them all. It can be between the frame and the siding, the silicone caulk cracking, a mechanical window that doesn't quite close tight, or anything else. It's a nice confirmation that your window has failed and leaks air.
With that said, I mean no offense to your beautiful country, but Swiss weather isn't as rigorous as Canadian weather. In the last week we've had a 36hour period with both +14c and -19c outdoor temperature. Our weather puts a lot of expansion stress on any outdoor facing material.
> Overall, some folks love repairing old broken stuff (or need to due to financial circumstances).
That's true. There's also a philosophical position that I don't like buying new when repairing isn't that hard. I've done it for TV's, computers, windows, etc. It's fun to learn how things work around you as well.
> Investing into relationships and intense experiences work generally better here.
I don't think they exclude each other at all
> I see plenty of older folks who maintain their houses and garden around themselves
For what it's worth, it's one of the better hobbies for retired people. It gets them outside and moving. Being close to nature is good for you as well.
Ideally they'd have hobbies that would keep them close to other people (the best thing for you), but all in all it's much better to be out gardening than on Facebook rotting their brain.