You are welcome to manually load an anaconda. Have lots of fun doing it for the tenth time.
You still don't get it, its a possibility for more gameplay AND its optional, are you smuggling? maybe the cops are checking the cargo and may detect the cargo with fake IDs.
Are you a trader? Do you have mixed commodities inside? then you need to learn how to store the cargo.
But this is what other game is doing, It was an example of how adding complexity in the game adds more gameplay value instead of adding more empty features with the same reused "press this button for tadaaa..." instant simplistic and easiest gameplay.