I raised this issue in another thread.
My concern was that my usual practice (for years) of dropping my iPhone into a Belkin charging dock resulted in the iPhone not charging overnight. I thought I had not docked it correctly but next time noticed the message that I needed to unlock the iPhone in order to charge it. I complained that this was an unannounced and pointless change with 11.4.1 but it was pointed out to me that Apple had “announced” it as part of the update. The security “feature” can be disabled, as Josh points out but I think that many people will be stuck with uncharged iPhones until they figure out the problem.
It is becoming increasingly frustrating that software we have become accustomed to suddenly changes its UI and simple actions have become more complicated. I had the same problem with Skype (Microsoft - say no more!) where the method of logging out became more tedious in a recent “update”.