Reynard
aka Ian Eller
At first glance, sure. but any actual consideration and the whole idea falls apart. Why does getting your brown belt make you better at resisiting poison? Can an PhD candidate really safely fall from twice the height as a Freshman? Why am I so much better at punching people after I get my CDL?Level doesn't have to be a purely-metagame element in the slightest, and can very well exist in the setting. All it needs is that some sort of in-setting training is required in order to level (which IMO should be the case anyway).
There's real-world examples* of "levels" all over the place, mostly to do with having to complete or fulfill one step in a training and-or experience+ process, and prove you have done so, before moving on to the next.
* - Grades 1 to 12 in school. Belt colours in martial arts. Apprentice-journeyman-master in trades. Loads of others.
+ - which experience points model beautifully!