First and foremost, that's insane. Not surprising, but not something I would have thought existed before being told about it.
I've never come across something like that in North America - I wonder if it's because (it appears) you'd need a special mount for the VESA mount to attach to?
Everything you need comes with the product. You staple the plate to the wall using little plastic films and then there’s another piece that hooks onto the plate. Then you attach the TV to that piece with screws into the VESA holes.
That connecting piece can either be articulating (like the one I linked to) or just a metal hook with screw holes on the other side (that's the one I have actually).
Looks like there's 232 holes in the backplate which gives you 464 staples to distribute the 15kg max across - giving ~32g per staple (although I guess it'd be biased from top to bottom because the TV would be a lever in the middle?)
Probably not. Japanese construction is the best in the world (I think, by a fairly large margin). I have always been in awe of the speed and quality of their construction industry.
Has to do with all the earthquakes they get, and strong government regulations (with big nasty teeth).
Japan tends to tear down and rebuild their buildings more often than other countries. Old buildings depreciate in value rather than appreciate as people in Japan typically don't like "second hand" items up to and including housing.
What's to hate about drywall? It's easy to work with. It's fairly resilient to abuse. It's easy to paint. It's simple to patch. Having dealt with plaster, wood and concrete walls, I can't think of anything I'd rather.
It’s also fire resistant, because gypsum has a lot of water bound up in it. Drywall will resist burning, and will also slow down a fire as it takes a lot of heat energy to convert the bound up water to steam.
I've never come across something like that in North America - I wonder if it's because (it appears) you'd need a special mount for the VESA mount to attach to?