This is purely anecdotal, but for me every toilet I use in the UK feels like the result of the local plumber trying to invent the toilet for the first time. So many varieties, so many weird ways of getting it to work, most of them failing to do their simple job. Mechanisms plastered behind the wall, using pumps instead of gravity fed tanks, little waterfalls in the bowl that circulate water instead of flush it down. Square bowls, unreachable toilet paper, even pumps to get the waste water out! I don't understand.
Feels like a solved problem in the USA, where a $100 toilet will use 1.3 gallons (~5L) of water to flush away whatever will fit down the tube. And do it through a gravity fed system that works without power and has about two moving parts that are easily accessible and repairable by any dummy that is using the toilet at the time.[1]
Is this a regulatory thing or a cultural thing? I've had so many issues with UK toilets. Why is this a problem.
[1] https://www.lowes.com/pd/AquaSource-Henshaw-White-WaterSense...