Not all 17 yo's are the same, absolutely.
Leaving home or refusing family holidays past a certain age says more about the family holiday to me, tbh, and leaving home is not the same as being left with sole responsibility of your family's house, and all that entails,.combined with festival and catching a flight when family is abroad.
I have first and second-hand experience of things going very wrong when DPs go away for a night, or many, especially when 'usually-sensible-freddie's' friends get to hear of empty house to occupy, and drink and drugs get involved. Over-drinking incidents, alchohol poisoning, pregnancies, rapes, these things are going on all the time in schools, sixth-forms, and uni. Being at Uni doesn't mean it's all good, many don't manage well, tons get hospitalised and very ill with 'fresher's flu' first and second week in, or fritter all their money, dabble in drugs and so on.
So, all very well those saying well I did this, or I did that, and all's fine, but at 17 all individuals are so so different just in how much peer pressure they can stand up to once had a few drinks. It's got to be a measured and managed call. There are idiots out there that adults struggle to manage let alone their peers.
You read the threads on MN all the time. Teens years are not generally known as a time of good self-regulation in any form, be it mood, or drink or inhibiting. That comes with age.