I think its designed to keep someone from taking the work, and selling it as their own. If you look at fonts, there are hundreds of thousands of unique fonts being sold individually.
Well, sure. But these fonts are already open source. So who would buy it when they can get it for free from Adobe? This is like the resellers of free software on ebay. Sure, you can sell to a few dummies. And it's a little annoying. But it's not something that's going to hurt Adobe or its image meaningfully. Why bother polluting your license with this restriction?
If it's only going to affect people selling free stuff to ignorant people, why complain about the restriction? Wouldn't reducing people essentially scamming be a worthy reason for having that clause?
One good reason to complain about the restriction would be that it's a potential violation of the open source definition and a GPL-incompatible "additional restriction" on redistribution. And because it's just dumb.