Thundershield
First Post
While this is true (to some extend) it's much less so now that Wizards are in charge of the magazine themselves. And often the magazines are checked for errata over the course of the month they're published. An example would be the Twofold Pact feat from one of the early Dragon magazines. It originally required you to be tiefling, but this was later removed when the compiled magazine was available.There's something else to consider. Reaper's Touch is one of the Dragon Magazine feats, which are frequently ill conceived and are never subject to errata. Sorcerous Blade Channelling is from PHB2, which may see future corrections. Many people will refrain from permitting Dragon materials in their campaign because of the poorly written nature, but the main book materials are rarely censored.
I do hope the "core only" trend is in regression. While it is true that there will inevitably be "broken combos" with all the material being published, people miss out on much more than if all material is allowed, but under the DM's discretion.