Bird's Opening

LMAO The statistics W/D/L = 33/25/42 % out of 6453 master games show that the Bird's opening is quite sound though black wins more often, that's true.

Bird's Opening is a perfectly valid opening, somewhat rare, but occasionally played even by the top players. I'm not sure why you assume that it gives advantage to black.
The statistics are biased towards weaker players losing as white as they look for an upset. Bird's Opening is very sound but can create some weaknesses on the g1 diagonal given the early push of the f pawn. The Stonewall will be the most sound but both the Classical and Leningrad are sound as well and create some dangerous chances for white.
****What people don't understand is that white's side does not grant a lasting edge for awhile and only promises equality - if you over-push as white you will lose in the opening****

Bird's Opening is a perfectly valid opening, somewhat rare, but occasionally played even by the top players. I'm not sure why you assume that it gives advantage to black.
Exactly as You said.
My rating filter is set to -50/+250 so it's safe to say that large majority of my games was against higher rated oppos.