I only really ever logged in online with my old bank when the mobile banking system wasn’t working. (I was with TSB so it was quite a bit after they moved mobile over to their new system.)
I find myself annoyed that my savings provider hasn’t got an app and that I have to input certain letters of my password EVERYTIME I want to login.
Mobile banking was the way forward for me, even before Starling existed. TSB’s poor app was the main reason I jumped ship to Starling in the first place.