i’ve also wondered about this…
You always hear “everyone has something” but does everyone really?
I think level 1 definitely does exist, look for example at most kids – there are plenty out there whose lives i would say are very normal – regular family life, no major drama, and except for an occasional fight with the siblings about who took the last candy, it’s just school, hw, school, hw. And i think it’s around for adults too to SOME extent.
But really, rating pekelach is hard, because to someone who has an 8 lo aleinu, they might look at someone who considers themselves as level 3 to be level 1. Or for this 8 person, maybe they have Hashem so much with them that to them it really feels like their own problem is only a 4, while this person with the 1/3 may look at that person as a 10 compared to themselves.