For me, parties are fun because of the other humans present.

Jokes, stories, laughter, insults, compliments, disagreements... those can be stimulating and rare experiences these days.

Sure, some of what you said is right - you can't play Xbox while you're at a party hanging out with people, and the opposite is true as well, you can't enjoy a party if you're off alone playing Xbox.

I'm an "all things in moderation, including moderation" type, so for me it's nice to occasionally explore the entire opportunity set available to me.

Plus, the social activity is good for your brain. We're built to interact and be social, at least to a certain degree.

Also drugs and booze can help a lot if you're at that stage of life!