I use my Santander for the high interest rate for my savings, barclays was my first account which i dont use and haven’t got round to closing. Natwest to see whether I was able to open another account then decided to try for starling instead. I wanted monzo but got starling for day-to-day use.
I’ve switched my natwest now into my starling as it is not needed. I use different accounts for different things to help me manage money better.