Have seen a few PG transmissions from the 60s with drain plugs. Otherwise, no.
The "automotive expert journalists" all used to say it was to make certain that instead of just drain and fill, you would be more likely to do it "right" and change the filter. It STILL would have made it much easier, and less messy if I could drain all the fluid (or 99% of it) BEFORE removing all the pan bolts.
Now, it is even worse. Some cars don't even have a fill tube, but at least they have a drain plug. I had to drop the pan and valve body on my son's BMW to replace some rubber tubes (certain they are not actually rubbber... but sure look and feel like it) that had "shrunk" slightly, losing their seal and causing the car to not shift properly. The ONLY way to fill the transmission was to pump fluid in from underneath. What a frigging cluster fluff. Of course, no fill tube means no dipstick either.
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