I only have one iOS 6 device left that I use daily. Its my iOS 6.1.6 iPod Touch 4th gen (thats on its last leg because a myrid of issues including a crooked housing, a bleeding LCD screen, a "unresponsive" home button and, a shot battery) I also still have my old iPhone 4S still on iOS 6.1.3 however, I retired it a few years ago to play around with Android.
I'm trying to keep this device running as long as possible. I've always preferred the old iOS 6 UI (to the point where back when I had a iOS 7 iPad I installed iOS 6 era shortcuts on it) and, even went out of my way back in 2013 when my first iPod Touch 4th gen was declared totaled to use the credit to go buy another 4th gen because it maxes out on iOS 6. However, starting this year, living with my iPod has become a lot tougher. Apps all of a sudden don't function anymore (Youtube just quit working on me today), I'm getting crashes all the time and worst of all, my homebutton has randomly stopped registering inputs. The accessibility home button is causing even more crashes when I have it on screen.
When I do have to retire this device, I'm probably going to keep my archaic iPod as the stable device while I go out and jailbreak the newer one. I'll get around to repairing most of the problems one day, but, for now, I'm seriously considering buying a new device and keeping the old one for another day.