One point in particular made on YDiS is about the minuscule and barely relevant rules differences between the original set through 3.5 edition. (It is true that 4th edition is just out in left field - a nearly complete departure from the original rules). With barely any effort and a tad bit of imagination you can pull a monster, a magic item, or even a whole adventure from something published in 1974 and play it with your 3.5 edition books. It really cracks me up to read on forums how worked up individuals will get over a weapon that does d6 damage in the Original Edition and the same weapon doing d8 damage in 3.5 edition.
This is the quote from YDiS that really got me:
If you do not have the imaginative gumption to bridge the insignificant mechanical gap between these [editions], then you should not be playing roleplaying games – you should be reading books. If you still need a creative outlet to express the glorious uniqueness that is you, write fanfic.Ok, I'm going back to work on my retro-clone now. It's going to have the 3 truly true classes, and only the 3 truly true classes, and it will have hobbits, balrogs and banths. Oh, and all weapons will only do d6 damage, because I know you were very concerned about that.
Sometimes its good to laugh at yourself a little. ;)