727 transmission deep pan question

How is that any different than a stock pan and a stock filter location. The full level on the dipstick keeps the fluid full in relation to the filter. Not arguing, just trying to understand.
I am no expert.......but in my opinion the same problem would exist with a stock pan and filter location......so if you run a deep pan but dont drop the filter you are loosing out on the benefit of keeping the pickup submerged.