Stuck in a Rut

Why are toilets more cultural ('taboo') than something invented or experimented with? Function isn't half the story. The weak whirl-swirl of my homeland's toilets always made me wonder ... but then I realised:   It's convention not invention. It's not as if the Brits deserve a reward for their awesome water-dropping tanks that flood down water like a cataract & get the job done nicely (with splashing). I bet the Germans won't adopt that just because 'it works'. People love their flushing comfort zones. Everyone's stuck in a toilet rut. ;-)