In my experience, it really depends on the trainer. Some cover SHO and WHO a little, a lot or not at all.
I have a few friends who recently took a Super Dave Harrington class and they spent a large majority of a two day class shooting one handed at distances up to 25 yds.
I agree one handed shooting and manipulation is an extremely important skill. I always run TLG's dot torture drill that incorporates WHO and SHO during my practice. A few mags every week of one handed at least keeps me proficient.
I have a few friends who recently took a Super Dave Harrington class and they spent a large majority of a two day class shooting one handed at distances up to 25 yds.
I agree one handed shooting and manipulation is an extremely important skill. I always run TLG's dot torture drill that incorporates WHO and SHO during my practice. A few mags every week of one handed at least keeps me proficient.