Testing a piece of chess "Wisdom'

I have heard a hundred time not to bother deeply studying an opening until you reach 1800+ rating. The old saw is 'tactics. tactics. tactics!'. But I never listened and bought tons of opening books and switched openings twenty times or more. But all that time I continued to study tactics constantly as well and have recently gotten my tactics trainer rating up to 1900. So in order to 'test' the theory that openings don't matter that much I played several games (Played on another site) with two openings that are considered dubious that I know NOTHING about just to see how I would do vs. my regular repertoire.  I have to say there was very little difference in my win/loss record even though I chose the Grob and the Gunderam defense! I would like to know if anyone else has had this sort of experience?

This doesn't surprise me. However, I do think people should study openings even when they are starting. But the key word here is study not memorise. If you study an opening you can understand much about how the pieces are coordinating with each other and understand why some pawn structures are good and others are bad. This helps you when you play an opening that you do not know.