doug@lewis1982.com

I haven't updated from iOS 10 to 11 for one reason: I'm still using a few 32-bit apps. Some of those old apps are orphans, and will never be updated. I'm slowly finding substitutes and moving my essential data, but I won't update until that process is completed. 

I suspect the the lag in adopting iOS 11 is in part due to many others still relying on old 32-bit apps.