I suppose because when we were in MARP years ago we were always glad that UB couldn't get to our current account. We had to cancel our DD with AIB after UB took more than the amount we had agreed with them and then switched to paying over the phone but they continued to present DD which we had to charge-back.Why would having a current account and mortgage with the same bank be a problem? In many cases this is an advantage to you, e.g. KBC offer a discount of 0.2% on mortgage rates with a current account, AIB give fee free banking on the account
The level of incompetence and down-right lies we experienced gives me an unsavoury feeling of schadenfreude to see them lose their jobs I must say.