I just love the monkey at a keyboard analogy ... now why do I feel an urge to hang from a tree branch and peel a banana with my toes?
Sounds like enterprise to me, in practising your troubleshooting skills.
In terms of repeating the process with the recommended command - your computer, your decision.
If the way you went is producing the desired result, I would stay with it, but that's me.
A test of the setup will be when the next kernel upgrade goes through, as there are occasions when the upgrade can alter your /etc/default/grub
I would certainly take a snapshot of the system as it works now. If you installed under BTRFS, perhaps install Snapper and use it, if EXT4 then Timeshift.