I've tried to split the bill this way too when I lived in Canada and didn't find it quick and easy at all.
First everyone needs to log in to internet banking, then they need to find out the email address of whoever is picking up the tab, then they need to wait for that person to receive their email notifications, then that person needs to log into their online banking to accept each transaction one by one... With Alipay or WeChat it is much more seamless, and the whole process can be completed in literally a few seconds.
It might not seem like much of a difference (a few minutes vs a few seconds), but once people get used to that convenience, I can't see them wanting to go back.
Splitting the bill at a restaurant? Absolutely. I use it for that all the time. That's mostly what I use it for, because it's so quick and easy.