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Yes we realize that if the bitcoin drop the price some of altcoins also followed to dump.
Ill think its because of bitcoin has a big marketcap and also being a number one coin in crypto so they need to follow on when the bitcoin be going increase the price. So that some altcoins are need to follow also but not all altcoins are being increasing the price some of them are always in dump situation maybe because of these have no development and no update.
It is true that the average price of altcoin is rooted to bitcoin and that is only BTC pairs, but others can also follow as long as they follow market trends, bitcoin has a big impact on other altcoin prices if there is a pump then the developer does not need to make updates and already their tokens will definitely follow the bitcoin market.