Actually, no. In Magic when a permanent changes state it does not "enter play" as the new state. One of the oldest and clearest examples is Mishra's Workshop: when you activate its ability to become a creature, it does not enter play as a creature, thus not triggering a number of effect depending on a creature/permanent to enter play
Actually Magic needs very very little errata. Clarifictions? Maybe, but I always found that a thorough reading of the Comprehensive Rules gives a remarkable insight into the game.
Clarifications in Magic make me react less "WTF I never would have thought that" and more "Oh, that's right, how silly of me to not get that by myself". M:tG's comprehensive rules manages to keep coherent a game with roughly a thousand new cards printed every year, as such it's like a work of art in the form of a rulebook to me.