I know that you cannot tow a vehicle with an automatic transmission the same way as a manual. This is because the automatic transmission will not be properly lubricated.
I read in the comment to this answer that the torque converter pumps the oil to lubricate the automatic transmission.
I read in this answer that manual transmissions on the other hand are lubricated because the lower gears are sitting in the oil and spread it around and that the fluid actually fills up around half of the transmission.
So my question is: Why can't automatic transmissions be lubricated in the same way as manuals?
EDIT: I dont feel that this question answers mine. It has to do with towing and the reason automatics cant be towed like manuals is because the engine is required to lubricate the transmission. So I guess what my question comes down to is, is is there a reason automatics need the engine to lubricate them rather than simply being surrounded and lubricated by oil like a manual? If not, why are automatics lubricated the way they are, requiring the engine to be running?