If bitcoin price didn't matter then no one will be using it and it wouldn't have its current value, before the price was low people didn't have any idea what to do with it but when it suddenly started going up every buddy started mining it which made it less and made its price go up fastly.
everyone want money and when bitcoin price go up , it's the chance for you to make money. but when the price go down it's feel like a disaster and everyone will just leaving so yeah the price for bitcoin are very fundamental