In your original Post, in bold text you state "This does NOT require root, and is a perfect solution to those who want to de-bloat and not have to root their phones." I have read it over several times yet when I try to rename the app suffix on my Un-rooted Droid Maxx, it says "Failed" - seems the majority of these files are "Read Only"! How did you do it Un-Rooted? Thank you for your work on this too... always appreciate folks sharing their knowledge.
It's true that you can only rename the .apk files if you are rooted. However, apps can be disabled while running stock.
The easiest way is to open the app drawer, grab the named app and drag it. That will show the home screen with an "app info". Drop the app there, and in the app info screen, tap the "disable" button.