Why are Crypto prices so tied together?

I’ve been reading about nonstop development and endorsements on SOL, ETH, especially Algo, etc. It seems like news does barely a thing to separate these markets. When companies release new products, hire star talent, announce partnerships, you see it break from the trend and respond a little more compared to others in its industry/class. Why does it seem that regardless of how good a couple of blockchains are, they don’t seem to break trend. Cardano was the only one I witnessed really break the trend until SOL. It just doesn’t seem to have rhyme or reason unless I’m missing obvious catalysts. Some of them are obviously exceeding others in productivity and creation. What are your thoughts?