A large chunk of this will just by improved procedures and tech† generally, driven by the desire for efficiency improvements, so it would have happened anyway, but I assume change was accelerated due to increased accountability requirements. The airlines, airports and other service companies involved are under pressure to know exactly what bags are where at any given time. A suspect package can gnarl up the system enough, but no one wants it to be on their watch that there is a call to find a suspect passengers bags and that is impossible due to a mistake. I'm surprised you noticed a change since 2010, given the sudden bump in security requirements from late 2001 I'd have expected a noticeable change closer to that time.

[†] less things falling off conveyors, getting their labels ripped off on the way through, better recording and identifying of bags via QR codes so if something does go the wrong way it can be easily identified and re-re-routed, etc.

Did you change how you packed while it was an issue?