If everything defaults to “Normal”, then it’s impossible to find and prioritize newly added games in my collection. Every game added to the catalog just continuously balloons the “Normal” list if you don’t curate each game when you add it. It also makes it impossible to discern which games I’ve actively looked at and chosen to keep at Normal and which games I might want to look at raising to High or lowering to Low.
I find myself continuously sifting through the same (giant) list of “Normal” games to pick the diamonds out of the rough.