kyledrum2002 could be any number of reasons, but I’d imagine for faders it helps them start the ball slightly left of target while still allowing the ball to fall right. A flatter lie would tend to start the ball right and have it go further right; obviously not great.
what puzzles me is why the OEMs’ products for better players tend to have lie angles so flat they’d be unusable for the vast majority of their staff players. Makes very little sense. A stock lie angle of 55* on a 3 and 5 wood? Never seen a tour player build anywhere near that flat.