OK. First things first.
The original post was about sidehilling and how to.
Lean it into the hill, big hand full of throttle and go.
Throttle holds the right side up, so no need for left side throttle in side hilling.
Now about the left side throttles and the bashing they are taking.
Throttle choice does not change sexual prefference, hanging out with Larry Craig does
Left side throttle is not normally ment or used for sidehilling.
Think about it though. It's about 2 or 3 times a year that they are really needed.
What ever you climb up, you have to ride back down. We all know this.
So what about the steep downhills where it's also steep off camber to the right and you need to go left to avoid trees, cliff, or rocks etc.
Rather than reach down hill across the sled moving your weight to the wrong side of the sled, and having to grab the huge hand full to correct what you just did, it's far better to just lean your weight back into the hill and use the left side throttle and mountain bar to finess it over to the left where you need to be, nice and smooth.
For those who complain that they can't learn it, think back to when you were a kid and learning to drive a clutch.
At first you hit the wrong pedal a couple times because the brake is right there too. But then with practice, you didn't make that mistake any more and then started laughing at others for doing it. It's exactly the same with the left side throttles.
So just take the time to learn your equipment.
That all being said, I know that about 1/2 of the mountain riders like having a left side throttle, and about 1/2 don't.
That's OK. weather or not you like having a left side throttle is no reason to bash others.