Not only are modern 6L toilets often unable to flush properly, but these small cisterns are too small for the reliable and leak free siphon flush system to work. So instead they are fitted with a bottom outlet valve which often leaks - and since this is into the toilet bowl this leak goes unnoticed.
So the "save the planet" move to tiny toilet cisterns to "save water" actually wastes it in two ways - needing 2 or 3 flushes instead of one, and continual unnoticed leaks from the cistern into the toilet.
Law of unintended consequences!
Modern flush valves are far more efficient than the old flapper valves plus you can usually adjust the fill valve to use the water required to clear the pan.
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