Furnace. Pulverizer. Duplication ends there - this is an old and extremely tired argument.
Apologies, I know this is a sore spot for you, and I in no way meant to perpetuate any nonsensical "IC2 copycat myths" on the subject. But there
is more overlap than that. It's impossible to avoid overlap when you want to implement certain features without making another mod a hard dependency. I mean, how do you handle machines that process liquids when you don't have Buildcraft installed? You need a liquid piping solution of your own. Heck, I've a feeling you were one of the primary motivators behind making liquids handling as we know it independent from Buildcraft in the first place.
Part of TE's issue in this regard is probably that is was marketed as a Buildcraft addon in the beginning (and regardless of what you were planning to do, that's what it indeed
was called by everyone, even in mod spotlights). So people saw a Buildcraft addon and asked (just to make an example), why does it need liquid and power pipes if Buildcraft has liquid and power pipes? I think for many people - me included, mea culpa! - the realization that TE actually works stand-alone came only long after it started doing so.
Personally I am a great fan of TE nowadays, and think that you have a very precise, focused vision of how you want it to be. I wasn't always of this opinion; at some points in 1.4, I had the feeling that TE was a bit all over the place and didn't really know what it wanted to be or where to fit itself in exactly in relation to other mods. From my point of view this changed significantly toward the better, which is why I attempted to use it as a positive example of how a mod can really tighten up its game over time. Please consider it as the compliment it was meant to be
And yes, a straight doubling/halving constitutes "a lot" for me