I'm in danger of becoming annoyed with some of the attitudes shown here, and casual disregard for water and resources conservation. What sort of question is "what is the point of water saving loos? Er, to save precious water, that's what! Low water usage loos do work, and work perfectly if properly designed. Rubbish loos of any sort of water usage don't work. My point is that bad anything is not good, so please don't say low water use loos are rubbish, just because you've used a poor one. I once had a dreadful car, but I don't therefore think that all cars are useless and should be banned.
Water is precious, we need to be careful with it. Therefore, please do your best to use an efficient loo, and that means a proper one where the cistern and the pan were designed as one, not a low volume cistern used with a pan designed for two gallons. The loo I fitted in my old house used 2.5 or 4 litres, for wees and No2's respectively, and it worked properly and hygienically.