It's bad technique because it makes it ungainly to run and gun effectively to the left off the break. Secondly, it makes it awkward to reload with your gun up when shooting offhand, and even if you can you'll be sticking your elbow out to be shot. It basically limits what you can do.
For those two reasons it would be a dealbreaker at most team tryouts. I wouldn't take on a player without a solid offhand when I was coaching, and I doubt that's changed.
Don't give up though - the way I learned was to force myself to *only* shoot with my off hand for a few weeks. Now I'm equal with either
- it takes a while but you'll get it.