The proof has been posted multiple times in this thread
https://streamable.com/6s01k
I think I understand what you are getting at. According to you, unless and until 100% or at least a majority of Apple's customers worldwide complain about this issue, it does not exist and only a minority suffer from it which makes it an isolated issue. Well here's some info. Apple didn't need to fix the 3DT stutter. I guarantee the average user never noticed it and it was only a minority of users on sites like these complaining about it but that does not mean the issue did not exist. It factually did exist and was fixed in this beta. The home button delay DOES exist just like the 3DT stutter. I can post a comparison video of my 2nd gen iPad Pro 12.9 vs iPad Air 2, iPhone 6, iPhone 7 Plus all running iOS 11 and the iPad Pro is the fastest at closing an app.
As said above the delay does exist. Now there are 2 possibilities. Apple cares about it enough to fix it. The other possibility is Apple doesn't care. So far it hasn't been fixed which leads me to Possibility 2 and any scenario which is a subset of Possibility 2 is intentional.
But where is this theory you speak of. The delay has been shown to exist on video. It hasn't been fixed till now. In fact its only getting worse. What message is this sending? If Apple wants to fix this, will it take a year till 11.3.3? Well whoop de do because enthusiasts like me would already be buying a new phone without a home button by then. Thanks a lot Apple
The home button delay is a fact. Whether you believe its intentional or not is your prerogative but the complete lack of interest by Apple so far heavily suggests this isn't going to be fixed. Its not even getting better.