I think it's normal for bitcoin to always be an indicator for all altcoins whether they want to go up or down and bitcoin has the right to get its dominance in the market. Sometimes not all altcoins depend on bitcoin, look at doge that has a high increase, so the main thing that determines is altcoin itself.
Most of the time, the values of altcoins would depend on bitcoin's value. But it isn't totally dependent as there are exceptions as what the trend presents. Bitcoin is dominating and influencial among all coins and it is unquestionable why a little change in its trend would affect the values of other cryptocurrencies.
Well obviously because it's where majority of the market is paired with. I don't know if it's good but it will give you a hint on how your alts will move if it follows bitcoin.
It's not good because they are not independent and any problem, rumor or news that happened in the bitcoin will give them all a huge impact to their price. When bitcoin goes down and then altcoin will go down at the same time but when bitcoin is not doing anything and altcoin will still fall. this market is not healthy.
