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Your idea of cold drain/fill makes sense, and as you said assuming the transmission has the correct volume of fluid to begin with.
My guess regards the checking of fluid level with transmission at elevated (operational) temperature would be that since all fluids expand when heated this method will eliminate the possibility of overfilling the transmission, along with insuring adequate fill volume. The total volume in the transmission system is somewhere in the range of 12+ quarts of fluid (transmission, torque converter, etc.) - so I can see how fluid expansion from increased temperature would affect the level by more than just a little.
(I don't believe a repair facility would ever consider doing a cold drain/fill as you've indicated- not good practice, too risky to assume initial fill level is 'correct'; they want to KNOW that the final fill level is spot on).
Good luck/Bill
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