Most young people have more applicable life experience to current situations than the average Boomer IMHO. Unlike them, others weren't born at the luckiest point. And didn't piss it away like them
Having seen it with Gore, Kerry, Obama (post win), Clinton, and now Harris, it's not a single mistake. The Dems would always prefer to lose to the right than win to the left.
Counterculture requires the existence of a monoculture.
Since the 2000s, there's ONLY split cultures that all consider themselves countercultures. Hell, Republicans think they're rebelling against the elites and deep state.
Meta was making Threads federate, so they know at least.