When a new supplier is created, it is possible to add their bank details.
However, if you ever want to view these details you have to modify the supplier.
I would think that these details should be seen on the supplier page or there should be an option to see the bank details under the “View” option within the supplier as you are not making a modification to the supplier so should not really be going into edit / modification.
Unless I am missing this somewhere that it already exists.