I have thousand's of 120gm and less vinyl and they sound great. It has more to do with the pressing and what copy of te master they used to press the vinyl that the thikcness.
If you don't or cannot adjust VTA and most of your LP's are setup for 180gm vinyl, you will get less bass and more treble emphasis than when the tonearm is level.
If you don't or cannot adjust VTA and most of your LP's are setup for 180gm vinyl, you will get less bass and more treble emphasis than when the tonearm is level.