Ahead of the launch of iOS 11, there were several signs suggesting 32-bit apps would no longer be supported in the new operating system, which has been confirmed with the release of the first iOS 11 beta.
When attempting to open a 32-bit app when running iOS 11, the app refuses to launch, offering up a message that says the app needs to be updated to work with iOS 11.
32-bit apps are also not available when searching in the new version of the App Store, and previously downloaded 32-bit apps can't be installed through the Purchased tab.
Over the course of the last several months, warnings about 32-bit apps have gotten increasingly dire. With the launch of iOS 10.1 in October of 2016, Apple started warning customers that older apps "may slow down your iPhone."
In January of 2017, the first iOS 10.3 beta featured an even more serious message when launching a 32-bit app, which specifically read "This app will not work with future versions of iOS."
Given the warnings, it should come as no surprise that Apple has eliminated support for 32-bit apps, but it does render many older apps that have worked for years without updates unusable. There are likely many users who continue to use 32-bit apps regularly who will be surprised to find that those apps no longer work when iOS 11 rolls out to the public.
https://www.macrumors.com/2017/06/06/32-bit-apps-no-longer-supported-in-ios-11/
Just like the last time we had this thread, developers knew this has been coming since 2013.
That's four years warning. It's on the developer to update, that's been supported more than long enough.
Apple has had documentation on how to update apps for 64 bit, for again, nearly four years.
Edit: (Tunesmith) Could also add that 64-bit app updates have been mandatory since February 1st, 2015. Any 32-bit app still on the store has not been updated since at least that time.
It's the right call by Apple.