Yes, mostly.

Are there killer features in banking apps that are not available via the bank's website? I understand that different people have different workflows, but for me, I tend to use websites over apps wherever possible.

Scotiabank works

Seems to work with USAA, though I haven't tried depositing a check yet.

It works for RBC in Canada.

USA here, it works with both my national banks and local credit union apps. One of my credit card apps gives me a pop-up on every page that it won't work because there's no Google play services, but it actually just works anyway. Had to turn exploit compatibility mode off for a couple of them though