When the loss of water is great it does of course become obvious. It’s when it’s comparatively slight and not noticeable that the problem arises as you can lose a lot of water over a long period. When overflows were external you were alerted to any loss by the dripping. A modest loss of water into the bowl is often all but invisible.
The ironic thing is that dual flush was designed to save water. In fact apparently most people always press the big button anyway so negating any benefits over a siphon flush.
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