I guess what I see from taller pitchers is "most" have that arm drag. Those that don't and have all the other attribute are good pitchers.
2020dad, I need to apologize for calling you out yesterday. I was grumpy and it struck me wrong. I agree 100% on a basketball court. Taller is better and the bigs do not get calls. I have coached basketball for over 15 years. I feel your pain on that one.
On the baseball field, I guess what I see is height probably is a small factor if they can get their arm thru at same speed and if they use their height for length of stride to its fullest ability. What I have seen in 1 plus year of D1 college baseball, plus 2 years of following it closely thru recruiting process is that size is all over the place on pitchers. There are very few 5'9" and under but there are very few 6'5" and up too. The above 6'5" pitchers I have seen are no more effective than the 5'10" pitcher. That is just my opinion from watching about 100 or so games over last few years. Some D1 colleges were highly ranked and some at lower end of D1, most in the lower middle.
To me the king is velocity however it gets achieved, Because it changes reaction time by the batter, then every other attribute goes from there, including height but height (to me) would be way down that list
The best 3 pitchers I can recall (all drafted high in last 2 years) were 6'2", 6'1 and 6"3. but all threw in the mid 90's will electric off speed which is what set them apart. Not their height specifically. It was all the other stuff I mentioned earlier
Son's team weekend starters are 6',6'4", 6'2". Son was #2 until he was hurt. He is 5'11'. Top bullpen guys are 5'8", 5'11", 6'2",6'4". We do have 4 other pitchers all between 6'3 and 6'6", there is, also one that is 5'10" and 5'11". they basically get no innings. So our best pitchers are 5'8" -6'4" and (from playing time) our worst pitchers are 5'10"-6'6". The separating factor IMO is velocity - the 4 starters (including my son) and the 5'11" bullpen guy (closer) throw 90+