Did you miss my next line? Chimps are stronger than humans in
some ways.
Chimpanzee “super strength” has been widely reported since the 1920s although a critical review of the available data suggests that the chimpanzee–human muscular performance differential is only ∼1.5 times. Some hypothesize that this differential ...
pmc.ncbi.nlm.nih.gov
We sacrificed strength for endurance after our split from other apes, but it turns out our muscles are only a third weaker than those of our ape cousins
www.newscientist.com
The greater strength of chimpanzees, relative to humans, may have been explained by American scientists.
www.bbc.com
In the most detailed study to date comparing the muscles of chimps and humans, researchers found that chimps are 1.35 times more powerful than people.
www.livescience.com
Mind, the last three articles are pop-science-ing the study in the first link, but the study in the first link is written in science-ese.
Yes, chimps are a bit stronger than humans in many ways. No, they can't outperform humans in the long run. Much like horses can't outrun humans in a long enough race.
If you want to write an entire subsystem for a game like D&D wherein whenever a Small species such as halflings has to make a Con save after performing an exceptionally good Strength check or they take exhaustion or suffer some other penalty to represent the fact that longer muscle fibers aren't good for long-term exertion, go ahead. However, if you do so, I will require you to create an entire phylogenetic tree showing exactly how humans and halflings are related
and make sure that this also accounts for how a human can quite easily be stronger than a Large ogre.
And at the same time, you will also need to say that a horse can only move at a Dash for 1d4 minutes before taking exhaustion.
Or, y'know, you can accept that fantasy people don't have to be built just like real-world humans are.
