Thanks for the excellent Wiki. I would just quibble with one statement:
Bank cards are not generally accepted at stores in Hong Kong due to its relatively high transaction cost. Only supermarkets, and places with higher average spendings (where the average spending is likely in the region of hundreds or thousands), are likely to accept bank cards as a mean of payment
This was true a few years ago, but the Covid episode (and the fact that essentially all credit/debit cards are now contactless) resulted in many more places accepting them. For example, all 7-Elevens and Circle-K convenience stores accept at least Master/Visa/Unionpay (for anything except topping up an Octopus card, which is cash only). Almost all mid- to high-end restaurants take them, and so do most of the low end chains (Mcd, KFC, etc). Most local stores/pharmacies/bakeries, particularly if they are chains, also accept contactless cards. The main places that don't accept cards these days are low-end local cafes / dai pai dongs, small local fruit/veg shops and market stalls; some accept Octopus or cash, and some are cash only.