I've never used a banking app, always use the browser version. It just seems like something else to worry about, I don't do much banking really. Barclays uk have their own 2fa pinsentry, my other accounts use sms which is usable with the dumb phone my dad has.
It's pretty sad, but for lots of consumer/mass market banking, travel (airline/train, utility) companies the app experience is less annoying than the degraded browser experience.
If nothing else, usually the app will only need one login / setup, then stay logged in, while the browser version probably logs the user out after 5 or 10 minutes and requires some stupid SMS/email/phone 2FA frequently.
