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the UK climate really doesn't help
My sister may have fond memories of my grandparents wet room in Malaysia. Sort of a shower - a tap, hose and bucket at least. And a tropical climate and copious permanent ventilation.
I'm less worried about the drainage issue, more about the constant wetness and humidity - wet feet going to the loo, damp toilet seat and hard to keep the tiles looking good.
I think the UK climate really doesn't help - everything is prone to staying damp all the time. But yeah shallow drain drops are awful, I would do almost anything to avoid one in the future