agree /tmp/steam can make much more sense. developers for example, are using this folder quite a lot. it can very annoying when there's like bunch of files with same suffix inside.
Closing as steam does not appear to leave a mess in /tmp anymore.
Nothing extracted yet.
Steam pollutes /tmp with its files (pipes). After a short time, I have a lot of similar files in /tmp:
Plus dumps folder.
Please use subfolder for your mess which is a bit irritating. :)