The crypto currency market's foundation is BTC and other alternative cryprocurrencies are depended on BTC at all. BTC is the king of the market and this its dominance is too hard and such interrapting from its side is very ugly and unnecessary.
Yes, most of the time, the foundation is what determines how the rest of the building will hold or will I say the root of a tree which in this case is more like bitcoin is what determines how the branches are going to sprout.
Bitcoin is the first and the most supported cryptocurrency in the space and altcoins are just certainly a way for whale investors to make more money off those who are looking to invest in quantity because they missed the bitcoin train. In that case, the altcoin market since it is tied to bitcoin market in terms of trading pair will always have a major effect on their prices.