I don't see that as edition warring: if I'm reading that post correctly, he feels Essentials versions of classes have fewer options than the broader 4Ed system as a whole allows.
In a sense, it would be kind of like asking about playing a no PHB campaign in 3.5Ed, and someone lamenting the loss of classes like Wizards & Druids.
Yes, this is exactly what I meant. Specifically, the martial classes. They're my favorite classes in O4E, and my least favorite in Essentials.
I've noticed something similar. The Slayer and the Knight are both solid classes, but neither really shines at anything unless work has been put into the build (I'm fairly sure there were absolutely no complaints about my Bludgeon Expertise/World Serpent's Grasp/Avalanche Craghammer dwarf knight pregen who was gleefully smashing people about or to the ground or using Come and Get It). But I needed to work on making the build shine rather than just come up with continual solid numbers.I like the E-Thief and E-Ranger (Hunter), but I have to agree that IME the Slayer & Knight seem very limited compared to the PHB-Fighter. Most players seem to swap them out first chance they get. It doesn't help that the online charbuilder presents their abilities so poorly.
It sounds like, however, that what you mean is the soft-cover rules books only. In that case, I'd say, "Why?"
Ditto.Definitely make sure the entire group is on board, because if they feel the same way as me, it might not end well. A DM announcing Essentials only would be me looking for the door.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.