"Tested on mices" is the The biologist equivalent to the programmers "it works on my machine"
If humanity ever perishes and the next dominant species ends up being mice, the discovery and translation of our research will usher in a utopian world for them.
I feel like physics is to the universe, as the lore of a Dark Souls game is to the gameplay. The universe is already built, and physicists just come up with the lore to explain the mechanics after the fact.