I was looking for that article earlier and could not find it. Have now included it in my original post.
Thanks for the feedback @GusB
As I mention in post #1, it is my, "go to", procedures after any update.
They will not fix corrupt or incorrect settings or apps that have not been updated by their developers for Android 11 in the Play Store, (there are lots of those), but it does increase the device's performance for a lot of users.
App Booster in particular, is so easy to use and does not affect your data.