I get where you're coming from - doing one hop seems near pointless. if it's 1 in 1 out, then that's especially true. If it's a vanilla payment transaction (which it usually will be anyway), then the adversary has a harder time, because there is nothing to suggest that you didn't pay a third party, who themselves paid the crowdfund (say).

(Technically 1 in 1 out can also be payment, it's just an uncommon pattern).

People overestimate block chain analysis generally. It's a huge datamine for investigation, but in itself it tells people a lot less about coin ownership than seems generally believed, today.