Not so much heresy as ... wrong. I'll have to disagree that if_then_else or Black Light District were anything other than top form for them. But I really like the post-Anneke stuff quite a bit, too, and continue to buy their stuff blindly without disappointment.
That "that said" said, I think "Afterwords" and "Echoes Keep Growing" are even better -- two of the best things I've heard from them in years, and really look forward to the new album.