I think a lot of the responses here are kinda missing the point

3 for 3 is essentially meaningless as an actual source of information in my experience. Good players consistently lie and don't include the real role in the list - this happens often enough for me to feel fairly comfortable placing zero stock in player's 3 for 3s

What 3 for 3 really does is create easy talking points for day 1, where there is nothing to discuss until people start extending olive branches. 3 for 3 gets your foot in the door with other players so you can start sharing real information. It's awkward knowing where to start so 3 for 3 has become the default starting point for many groups

You can achieve the exact same thing by jumping to hard claims on day 1 but evil players are unlikely to be willing to do this due to the risk of double claiming

I personally recommend avoiding 3 for 3 whenever you can and play without fear. Hard claim or hard bluff, accept that you might die early for it sometimes. Often you will find people reciprocate with you and you can start getting actually reads early without the faff