It's just that oxidative phosphorylation with the mitochondria is dramatically more efficient than basic ass glycolysis. Animals couldn't exist as fast moving creatures without mitochondria.
The meme about the mitochondria is only for people that haven't taken biochemistry. But the citric acid cycle is super interesting.
It's hard for the subreddits that barely have any traction as is. But it's entirely feasible for most of them. Is there a way on lemmy to have small communities new post always come up on the top of your feed?