Why is "Banker's right to combine accounts" trending?

Wikipedia Overview

Under English law, a bank has a general right to combine accounts where a customer has multiple accounts with the same bank. The right has been recognised since at least 1860. However it was not until the 1975 House of Lords decision in National Westminster Bank Ltd v Halesowen Presswork & Assemblies Ltd [1972] AC 785 that it was finally determined that this was a type of set-off right rather than anything related to the banker's lien. Typically the right will be exercised where one account is overdrawn and the other is in credit so that the bank can secure full repayment of overdraft without the need to take any further action with respect to the customer. The broad rationale is that separate numbered accounts are set up for administrative convenience only, but the legal duty upon a bank to "account" to its customers for the sums held by it only extends to the net sum.