Yes I agree with you in most cases. The street cars that are blown especially do pick up a bunch when switched to an automatic. First the blower likes to be tugged on like a stump pullin' diesel. Second the street transmission and clutches just aren't the best for drag racing.
There is a big difference between street stick shift transmissions / clutchs like a Tremec and full drag race stuff. I'm running a McLoud 8" dual disk clutch with iron disks and a G-Force transmission with a vertical gate shifter....you just pull and push back and forth without lifting and without worring about blowing the trans apart and you cannot down shift. Also the clutch is adjustable so you can compesate for a lot of things.
Lastly stick transmissions are all I really know. I've been racing NHRA Comp Eliminator for 15 year with a stick shift deal. I currently have the NHRA Comp Eliminator E/A National Record in my 1992 Ford Probe GT ex pro stock car 2350lbs. It runs a 312 cid sbf with two carbs and no power adder. The engine makes 855HP and the record is 7.64 at 177mph with a 5 speed.
Here's a pic that is a couple years old...