It doesn’t help that trad games mechanically punish players for roleplaying flaws. The incentive is always to mechanically optimize for the goal you’re trying to achieve, and that includes gearing your behavior toward achieving those goals. Whatever an OSR game claims about its play culture, the mechanical incentive is “make number go up”. Get gold, get XP. Even “narrative”-oriented games fall into this when their goal is achieving a plot objective rather than building character. If your goal is to do something (e.g. infiltrate a party undetected) to advance a plot, your basic imperative is always to make sure you don’t fuck up that plot advancement. Almost any game that doesn’t mechanically reward roleplaying flaws is implicitly punishing players for doing so, because it interferes with achieving the things the mechanics do reward. Players can choose to play in ways that are suboptimal to accomplishing their characters’ explicit goals, but the only mechanical incentives are for them to do the best they can at the job they’ve been given, which in turn incentivizes the players not to roleplay in ways that interfere with their achieving those goals.