Yeah, I wouldn't disagree with that. Like I said, I'm not really trying to say that GMing is as easy as playing. My point is it's not as significantly harder (or need not be, at least) that many seem to think. I'd like to see more people try to GM, and the perception that it's so hard is an obstacle.There is absolutely room for resources to help DMs (both new and old) improve their game.
That said, finding and using those resources (and avoiding resources that though well-intentioned may be detrimental to your game) is a skill in and of itself.
I’m also skeptical of any claim that X system has made GMing as easy as being a player, and can (should?) be imported into D&D.
I think there are resources available to help make gaming easier. Like anything else, there's plenty of noise to go with the signal. But there is stuff out there. Of course, what will work for one person may not for another.
As for what can or should be ported into D&D, that's certainly going to depend on the specifics. There are plenty of mechanics that, however great they may be for their respective game, simply wouldn't work in D&D. There are others that may.....see my post above in response to @Imaro for a few examples.
I do think that playing more games than D&D and those similar to it is something that will help a lot of people by offering different methods and practices that, even if they cannot be ported directly to D&D, can inform how they DM.