I think this could be useful when you want to add a picture or video ect. To a profile post and you don't want to have to go through igmur or something like that or have to format it yourself - Because I stink at formating
The problem is that TCF is neither intended or designed to be a file hosting service. Facilitating file hosting regardless could cause all kind of issues/increase upkeep cost (and that's not even considering the costs for implementing such a feature in the first place) for doing something that is strictly speaking not at all necessary.
I realise directly uploading to TCF is easier that using an external site, but it's an unwarranted comfort at any rate.