McNaught used to have one of the nicest heels you've ever seen, but he moved to a bulkier heel citing both sound and stability issues. That's enough to convince me, frankly -- you know he can do the nicer heel, it's what he originally envisioned and did for years, so you know it's not a cop out when he goes through the hassle of reconfiguring it for a bigger one.
On Kiesel's CT model (their PRS-alike), the neck heel has some bulk to it. But, you can get a shaved-down heel. I've asked if this was still available a while back, and they said "yes", but it's done by hand, so it's not a cheap or returnable option. When I asked if there were any plans to make it the new standard for the model, the answer was "no".
I didn't get an answer as to why (don't remember if I ever asked) but it could be anything from:
1) "the type of customer that is buying this type of model has certain expectations, and a voluminous/massive heel is one of those"
2)"It's not a super huge seller anymore, and we just don't want to spend the time/money on re-doing the CNC programs for new necks."
3) "there is/are some negative consequences to doing this (tonal, the longevity of the instrument, etc) so while we'll do it, we don't want to do it to every guitar."
In comparison, they have two more modern "set-through" guitars, and both have heels that are more svelte:
Chris Letchford signature (which is basically as smooth as their neck-through):