That's the thing - we already know that each given interest group has common interests. That's how you build coalitions, by finding those common interests and tamping down on the differences. The problem with the youth vote that we know, is that if we cater to anyone other than them, or god forbid have any opinion they disagree with, they get disillusioned or even outright hostile (very much to their own detriment), for reasons I speculated on above.

So it's better to treat them as a totally unreliable voting bloc that is nice to have, but in no way should be treated special. They are fickle, impossible to corral, and make particularly awful coalition partners.

Bernie, for one, would have done well to use their energy to launch, as he did, but then switch to broadening his coalition, rather than doubling down on catering to their every whim and attempted browbeating. That rigidity and tunnel vision is what sunk him, and is what would have led to total electoral collapse if he had somehow made it to the nomination.