I think the trend to make EMG's that sound more PAF-like was ridiculous too.
However! I will say that it's only nominal because that's kinda like where the whole romantization of vintage and mid output offerings started (for Metal), I think.
The EMG 57 sounds NOTHING like a PAF. It just soundsl ike a slightly different take on the EMG classic recipee. It's fatter than the 81 in the low mids, but also has some more added sparkle up top. It is not more dynamic. If anything, it's the opposite. The preamp is not different, and the wind/maget is hotter, so it clips more internally. Sometimes people just hear what they want to hear. But you just gotta look at a DI recorded with one vs. the 81, you don't have to look hard to see it's more compressed. However, because it has exposed poles, it does do something nice to the attack which makes it feel a bit more responsive. Or maybe not more responsive, but responsive in a different/less smooth/even way than the 81.
I personally like to think of the EMG 57 more of an 85 that has been de-mudded and made less smooth and a lot clearer. Like the best from an 81 and 85 smashed together, and then +1'd with some high-end sparkle thrown on top (keep in mind, this is comparing all EMG's, but comparing it to passives, it's pretty much the same EMG EQ curve with the hipass/lopass effect).
The EMG Het is closer to the 81 in terms of EQ, just with a touch more low mid content, some more aggresion to the attack, and A LOT more output. It's pretty much Blackout levels of output at that point, just more compressed because it runs on that same old EMG preamp. It's a cool pickup. Think of the Het as the middle ground in EQ between the 81 and the 57. But when it comes to output, it goes 81, 57, Het from lowest to highest. Well, "output" is the wrong word, because they all technically have the exact same output when ran at 9V. It's just the Het is hotter, then the 57, and last the 81 before the signal hits the preamp.
I will say, though. Back when I had the AHB-1, I saw in the DI's that the AHB-1 at 9V had the exact same headroom than the Hets at 18V. So you just gotta compensate running them at a higher voltage to reach Blackout levels of dynamics. The voicing will still be different, though.
I like all of the classic EMG's, personally, that I've tried. I have always found an application for all of them.