Not all best practices are "necessary" in terms of what is minimally required; that being said, that particular way (including purge) aids in ensuring stability.
Thanks, and fair point - I just didn't have much time and needed to get things going. I also left most of my update/upgrade flags at 1 - something I have to fix later. So I guess skipping the purge part is for folks like me that had just a couple minutes to get their rigs back up.
I'll follow your advice and purge and reinstall later on when I have the time
