And how do you think westerners live? with a bag of pennies in their hands?
I never paid with cash in France for almost 6-7 years. (100%cashless) I just need a plastic card... in my wallet (along my IDs-Licence etc) or my Phone with NFC
So We know what is being cashless.... The Support may differ...the End result is the same.
But I can understand when a Chinese like you, coming in X or Y western country without a debit card or a way to pay with your phone ( Apple/Google/Samsung pay) may find it difficult and therefore resort to "cash".
In our Time, in any western country...you can pay With OR Without cash... you've got the choice.
So keep you assumptions aside...
ps: Before 2011, I had cash in my wallet, that i will ONLY use maybe 20-30% of the time. and that was like that for almost a decade... (2003-2011).