With improved (and patented) design, they can flush much better. And they have better coatings on the ceramic, so that your "output" washes off much easier, and

With improved (and patented) design, they can flush much better. And they have better coatings on the ceramic, so that your "output" washes off much easier, and doesn't stick to the walls so easily. The modern tests for toilets are much tougher than the old tests, and the best modern toilets will pass with flying colors on those tougher modern tests. Older toilets, and lesser quality toilets, can't hold a candle to the kind of performance you are able to get with the better and more modern toilets. Toto is just one example. They're not the only one with top performing toilets. You can look on Consumer Reports to see the tests they run, and which toilets do well on those tests.