Generally speaking bricks are an environmental disaster and stud walls at least make it easy to make changes. But the real issue with British houses is that they aren't really "designed" at all. The builders employ architectural engineers whose only concerns are making it as cheap as possible while meeting all the regulations, then tart them up with a few nice fixtures in the show homes. Some I have looked at are so bad you find things like doors that hit each other if you open both of them, or garages too small to put a car in.
The most important thing from their point of view is maximising profit, which means as narrow as possible to reduce the amount of road they have to build. UK houses are the smallest in Europe and even smaller than Japanese homes. Combined with poor layout and usability it's very, very difficult to find a decent home here and that's why I'm keen to avoid modifying it as soon as I get in.
There are also some problems in specific areas, e.g. down on the south coast of Hampshire a lot of buildings are crumbling because of high sand content in the mortar and plaster. Here you literally can't hang a picture, if you put a nail in it falls out, along with a large chunk of plaster. Trying to add network points is going to be extremely messy and require a lot of fixing up afterwards. In fact one popular fix is to just build a stud wall over the existing brick/plaster, especially if it is wallpapered because it's easier and cheaper than trying to fix what is already there.
While i'm not sure if this is the place for this discussion, I suppose it is as it's regarding network cabling, I also live in Hampshire but the North, and recognise the solidness of older houses over new ones. I agree new houses are not great I would always go for an older house, which were generally built much better and have bigger rooms.
I would much rather hang a picture / shelf etc into a solid wall with proper plaster, easy with a decent SDS masonary drill and rawl plugs. Fittings onto stud walls are terrible and no where near as solid.
Yes a lot of plasterers would rather hang up a new bit of board rather than replastering or skimming properly. It is perfectly possible to run cables through the joists etc and just chase up to network socket in these older buildings.
Not sure about Japan, from my little knowledge they live in very small apartments all in little rooms on top of each other, even the hotels I have seen seem tiny.
I've watched a few shows about American houses and they seem to be all built of timber and plywood and fall down at the slightest breeze. Yes they maybe easier to wire up or modify but again I prefer my solid 1935 house I know isn't going to fall down. Ask the three little pigs.
Regarding Bricks not being environmentally friendly, I would argue that using so much timber is worse. While Bricks, as in all manufacture produce some CO2 this can be fired by natural gas over other fossil fuels now, they are reusable often, clay is an abundant resource and requires only low level digging, they have a life of 100 years plus, old bricks can be crushed to make new building materials, they are a good insulator and are mold and fungus resistant. That and they look better than modular housing.
Good luck with your cabling.