What's odd is that you concentrated on the term I used vs just answering the question. Why is everyone against Exif data?
The less rules you have to post images, the better. It has to be simple and easy for anyone to understand, remember and follow. I don't see anyone here against EXIF data. Like Bitter said, it's useful for some things, but we should concentrate more on what we see when giving C&C.
If you see anything strange and want to take a look at it, then good for you. It's pretty easy to get. But other than that, what would we gain from having this thing mandatory when posting pics? Doesn't make sense at all, plus it would take a great amount of time an effort to educate people where to get it, what's important about it... And take into consideration the forums gets new members every day... So, again... what do we won from doing this?