the first time in 20 years I CLD thumb start a ball was a lil more than a week ago. At the range w my Howdah and 1803. The 1803 using the .530 and .010 option loaded nicely w a short starter. The Howdah however...: I measured the charge, placed it in the left barrel, fetch a patch and placed it on the muzzle, got a ball, and while reaching for the ram rod, my thumb which was holding the ball in place just pushed it in. I sat there dumb founded for a minute or so. My 1st ever exp w BP or MLers was a Charlieville .69, but ever since then it has been riffled barrels that required a short starter.
As to why people are lookin into it; some argue that there's no documentation of them beyond a certain point in history, others I am sure just dont want to carry the extra kit.
Dunno mate, been wondering the same thing, m'self.