I prefer the FBI cant no matter if it's for a revolver or semi-auto. I have a Sparks 200AW for a 4" N-frame with a straight drop, and it's fine. But FBI cant is easier to draw for me.
You should rename yourself "chickenwing". Draw from your goofy FBI cant holster in front of a mirror and you'll understand. You also ain't very fast on the draw.
While TAK didn't sugar coat things much in his delivery, he's also correct. The ONLY practical reason I see for an "FBI" cant, is concealing a handgun that's too large to conceal well with a straight drop due to the handgun's grip poking out the back of the wearer's clothing.
I MUCH prefer a straight drop, and detest the chicken wing draw (and mandatory forward lean), but I do have a "pancake" holster with a strong forward cant that hides a Glock 21 crazy well. It's a conscious trade-off for concealment's sake. While on the subject, it's a Kramer Belt Scabbard in horse. For field use, or while concealing anything smaller than that huge chunk of a pistol, I'll go straight drop. A second exception is when carrying IWB, behind the my right hip (at around 3:30-4:00). A slight cant is helpful there since the gun isn't lined up right on my hip.