Preparing content for a game release takes a lot of man hours by the entire team, coders have to make an exporter for the game format that is usable by the artists, meaning lots of graphical interface, descriptive options for engine features. Artist have to load each file to make sure all settings are correct, export, bundle the export and then upload it somewhere where all exports live and then rinse and repeat for every asset. A content manager (if there is even some one like that on your team ) would then check if all assets have been exported and he has the the latest version of all and stick all of that in an even bigger bundle to give back to the coders to create an install file for the game. Now imagine just after release you noticed a small stretching of a texture, you'd have to go through this whole process again!