Four is the sweet spot. Big enough that one person bailing doesn't kill the vibe, small enough that nobody gets left out of the group chat or the Uber.
Four nails the balance so convos stay tight and decisions don't drag. Plus it dodges the logistics mess when one flakes last minute.
Three has the right balance; every voice is heard and decisions come fast, while four invites drift and more friction.
Three binds loyalty, speeds decisions; four invites factions and leaves you adrift when one bolts.
