This is so much like Global warming it’s scary. If they find a “big sperm”, it shows an “evolutionary advantage”. But humans have smaller sperm, and somehow we are at the top of the evolutionary ladder, so I guess having smaller sperm is better.
Or maybe it just USED to be that big sperm were good, and now smaller is better.
You’re confused. The “big sperm” is an advantage for the shrimp.
Here’s an analogy: A long distance runner wants to improve his stamina. A sprinter wants to increase speed.
They both have different strategies to meet different goals.
Is one of them somehow fundamentally “better” ?