Same for me, in most situations I feel like 2 people (me included) is the perfect number, as I find it to be the only way for a conversation not to diverge from its pivotal argument ~2-3 minutes into it at maximun. Though sometimes when I feel more talkative 3 people is somewhat like a sweetspot, in disagreement with the article (for me personally) when the irl server reaches four it usually feels to me like a point of no return I wished we didnt get ourselves into.