> Blockchain does not make banking obsolete

It doesn't, but Satoshi thought it would. See for example the Genesis block.

> There is a whole crypt banking sector that provides exchanges, custody, lending...

Back in the day, the idea was to make every citizen financially sovereign. It didn't work in practice because those services you mention are useful. (Just like crypto has trouble working as a payment infrastructure, because chargebacks are an useful and demanded service)