welding seabee   : "With O/A you quickly learn molten puddle control. "
Hear hear!  I'm a long time non-pro personal project welder. self taught. Stared with OA 'cause I was introduced to it in junior high shop class.  Got my own setup when about 25.  It just made sense,  perhaps I warmed to it as prior I did a lot of soldering.  Puddle control is - for me - real easy because of the opportunities of using pressure of the gas flow from the tip to manipulate the puddle.  
Since then I got a MIG and after some time can do decent with it. Recently I got a stick welder but haven't spent much time with it, and am challenged.  But the OA gas has always and still seems intuitively easy...