Although the focus at Rumbles is on feats, there are also certain benchmarks that we use as a short hand for comparisons in addition to feats. One easy example is Marvel strength class system from the old handbooks. While Class 75 is not necessarily interpreted as simply lifting 75 tons, we all understand that a Class 100 character is significantly stronger than a Class 75 character. In a straightforward contest of strength, like say arm-wrestling, the Class 100 guy always beats the Class 75 guy.
Are there some comparable benchmarks that we can use for skills? I would like to think so. For example, a modern character who is a military veteran can probably be assumed to have at least basic proficiency with firearms, HTH and some survival skills like reading a compass. A character with multiple PhDs can be assumed to have a certain level of overall intelligence and knowledge of those fields covered by the PhDs. And a character with a black belt in a martial art has at least a comparable level of skill with another character with a black belt in the same martial art, though one of them may have additional advantages like greater strength, reach, speed, etc, as well possibly superior innate aptitude.
In absence of relevant feats, benchmarks should carry some weight. But I could see relevant feats being more important than the benchmarks, as long as they are not obvious outlier feats.