Frankly, I don't trust banks or their friendship with Bitcoin. Can the two traditional enemies become close friends? I doubt it, because banks are fully centralized, while Bitcoin is fully decentralized.
I believe that such facilitations for banks to deal with Bitcoin and cryptocurrencies may be part of a long-term policy pursued by governments to contain Bitcoin rather than ban it. I hope I'm wrong and that this shift is actually toward adopting Bitcoin and cryptocurrencies, not containing them and centralizing them by linking them to banks.
Actually, many government technocrats and expert had done some searches about about Bitcoin, and i am sure that Bitcoin has the potential to dominate faits, hence the facilitation is been initiated out of the existing fears a total Bitcoin dominating banks.
Since the inventions of Bitcoin, there has been strong battle by banks, using every means possible to ban the use of Bitcoin, but all failed. Now they are back again trying to make a unnecessary union but it still gonna fail. The reason, just like you mentioned, is basically the different in concept, Bitcoin is a decentralized digital currency, while bank operates a centralized system.
Again, like I said in one of my post reply, the union or links between bank and crypto would have helped the banks to generate more revenue but will not be an attempt to make Bitcoin a centralized ecosystem. Bitcoin will always remain a decentralized digital currency in whatever plans the government has planned.