Since you are not looking to change policy, PerfectN, as mentioned ... I think it's nice that you have somewhere to vent and complain.  But, it is, after all, just a complaint.  No one ever said that you shouldn't state your opinion.  You can shout it from the roof tops.  

You did a little more than just say the policy is stupid.  At least, you said a lot more than that in your original post.  Had you simply said that, in your opinion, the thumbnail policy was stupid, and left it at that, who knows if there would have been the same thread at the end.

And, LeoLang, since you haven't posted any art (that I know of), why don't you focus your energy on making some?  And, you can even leave in all the things you mentioned .... just don't put them in the thumbnail that is used to preview the image.

Could be worse, could be raining.