IMHFO (to you automotive engineers, or the damn bean counters more like)
everything that has any replaceable/serviceable fluid in it
that needs changing/servicing at any time, in/on any car or truck should have a drainplug
& a filler spout, with cap &/or dipstick, Federally mandated
having to take the pan off to drain any Torqueflite is stupid
I never have understood oversite or that cheapskate crap,
cheap *** penny pinching (bean counters), to save a $ 0.05- $0.25 cents in the process
I often change to an aftermarket cast alum. pan, 1st fluid change
so I have a drainplug for ease in servicing, same on the rear ends, or covers/pans