Barclays asking me to close my other current accounts?

Hi all, I recently opened a Barclays Premier current account to get access to Avios Rewards and Apple TV+ for free. During the in person ID check, the clerk asked me how many other current accounts I had and then said I should close them after moving to Barclays and he said that due to regulation people should only have 1 current account... I just kind of said "I probably will close them yeah".

I'm not really tied down to my other current accounts but I do like having access to multiple emergency lines of credit as I have overdrafts with both Lloyds & Starling, as well as a Starling easy access saver pot.

Is this something other people have come across, or was the guy just trying to get me to be an exclusively Barclays customer? The account opened fine and I haven't closed my other ones, maybe I'm over-thinking it?