I max the spells of every champion I use in game in a different order depending on how the game is progressing. There are times I max q on orianna first, there are times I evenly max q and e because I'm getting butt mucked. There are times I'm playing soraka and I max q first (because I'm going ap mid lmao) and there are the other times I obviously max my heal. I feel like some champs have a very specific leveling path, but other champs are more adaptable to each game. And maybe this would be helpful to some, it could overall hurt their gameplay.
Not to mention I use Alt+ability to auto level my abilities. Half the time I don't even remember leveling things anymore because I do it so fast based on the flow of the game. I can't tell you how many times I went "oh shit I'm level 7 I had ult for the last 2 minutes" because I just... forgot I leveled my ultimate.
Edit: Also, what if you forgot to change the leveling path and you accidentally took the wrong level path for a champion. xD (Unless you mean per champion. Rather than like a mastery page of leveling.