> And the ones that aren't are in some other cooked format.

Maybe, if you never create anything. I make a lot of game art source and much of that is in uncompressed formats. Like blend files, obj files, even DDS can compress, depending on the format and data, due to the mip maps inside them. Without FS compression it would be using GBs more space.

I'm not going to individually go through and micromanage file compression even with a tool. What a waste of time, let the FS do it.