The EU bank market is weird.
Most comments here don't understand that for some customers, not having to upgrade the mobile OS is a feature, not a bug. You might care about safety etc. These users just don't care - it's another person problem, so they don't want gizmos to enhance "safety" if they are cumbersome.
The intersection of these customers with Coutts typical clients (>500k in liquid funds according to the comments below) may be just as high as the N26 users (let's say, "less privileged") who want the latest mobile OS version and receive OTPs by SMS to protect their precious $100 purchase.