I'd like to play with the errata and 2E versions, but I'm never going to be keeping a mental list of cards which changed +cards to draw cards, because it has no functional change except with Way of the Chameleon. Throne Room I remember because even though the functional change doesn't usually matter, it's always there. I also don't feel like looking up a list of those cards every time I play.
The key difference here is that knowing the errata isn't what causes you to choose it. It's remembering the errata.
In my view the problem is that people could play a game with Chameleon and Storyteller where it was a great combo, then play another game with another physical set or play online, and it's completely different. If you're not attentive to that, it has consequences for you, and why would you ever be attentive to that? It could be that the players in the game have different prior experiences; some expect it to work one way, some another way.
Sounds like Chameleon may be a definite pick for your online banlist
It seems like more generally you take issue with the existence of the 2E, as the problem you're describing already theoretically happens with various card combos between editions. Different players will have different expectations for how Possession, Masquerade, Trade Route- among others- combo with various cards based on the version they're used to.
Ultimately, I don't think this Chameleon issue is gonna be a very big deal. Those of us who are here are likely to care more than most, and we'll consequently probably learn the list of Chameleon exceptions pretty quickly.
Either way, I'd rather have it than not, because it's a pretty dang neat landscape