Immune system.
Is what makes you feel so terrible when you're sick, that's why you don't want to get it involved. Like a car driver would rather not see the seat belt and air bags do their life-saving thing.
Fun fact: Up to the Civil War or WWI, more soldiers died of illness than of battle wounds. So much for the fabled immune system. And if WWI killed more soldiers in battle, the flu still won that round, because the Spanish Flu killed heaps more later. Now we still remember WWI for its bloodiness, but without Covid-19, who would remember the Spanish Flu?
Roborock didn't win because of doing marketing, they won by being technically superior and word of mouth, in spite of lack of marketing, at least in the west.
Same how Japanese cars beat US made cars in the 1980s even though US cars had the most amount of advertising in the media. Even Steve Jobs said in the 90s that US brands have the best marketing and win all meaningless "awards by industry critics", but if you ask consumers which products are best, they all say the Japanese ones.
Chinese products are now the new Japanese. I still have no idea why westerners assumed "Chinese can't innovate, they can only replicate".
Did they? For how often online comment sections about China need to point this out, I can't remember seeing this claim being made in reality ever. China has been the next big thing for the past 25 years. And if people pointed out that Chinese products were of low quality, well, that was certainly true. Japan and Germany were also at one point known for low quality products.