The ongoing support for iOS 12 is an interesting development, I hadn't realised they'd started doing this until someone brought it up in another thread recently. As no devices got left on iOS 13, it is effectively the previous release, so I wonder if extended support for the current -1 OS version will be the norm going forward? The 6S is rumoured to be dropped by iOS 15, so perhaps 14 will go on getting security updates a while longer?