It is true that banks offer services that, compared to others, are well protected. I have no problem in principle with banks or other reputable organizations, private organizations, being responsible, say, to manage the common identifier. That's one element of the system. What type of information they actually get when the government delivers services to the citizens, for me, is a different issue, but in terms of managing a secure common identifier, banks are probably well placed to do that.
On January 31st, 2019. See this statement in context.