You don't get it that most banks do not do that? I am unsure why you are confused about that?
Until last year you had to wait up to 3 days to do an interbank transfer but not anymore. (same bank transfer would usually clear within the day)
I have used it quite a bit since it was released and I have to say that it does the job. The only downside is that it is tied to your phone number and I am not really sure what the process is if you want to change it.
Many other countries in the world bank transfers are easy and free (within the country). I can transfer to anyone from my phone, and do all the time. No apps or special services needed.
IMHO America likes to hinge these arguments on "our system is too old, we're just too big, etc.", but when it comes down to it are just excuses to allow banks to continue fleecing their customers.
This is one reason Venmo is successful. Paying someone is easy. Receiving money is easy. No one wants to spend 5 minutes setting up a payee on their phone when they’re splitting a dinner bill.