Rat tang or stick tang is a spectrum of of tang with different designs and even size. It is not a fixed design.Please define "built correctly".
For all intents and purposes, I think we can safely say that the term "combat knife" is synonymous with "survival knife" in today's world. And for a "survival" knife, a stick tang is the last thing I want on a knife that may see use well beyond whittling some feather sticks. A survival knife should be able to pry, chop, and yes - even baton, if required.
All other things being equal, a tang that is half as wide, is also half as strong. Why would you want a half-strong knife when there are so many other good full width tang "survival" knives available today? (Unless of course, your only intention is making the aforementioned feather sticks.)
The Kabar - while a good knife - could be a great knife, if they finally decide to upgrade their 1940's tooling and produce a knife with a full width tang.
Here is an older post from this forums where other members show the Kabar MK2 stick tang, their tangs is about half the side of the blade. Then also some the Becker series full length and width tang.
Please, allow me to use the pictures from the from the maker of my knife.
This 7 inches blade has much beefier tang than the Kabar mk2, which is also 7 inches.
	Serration on smaller knives for extra adhesion with the handle. The tang is closer to the spine than the edge instead of exact middle of the blade with a thinner tang width ratio like from Kabar.
	Allowing big handle on medium knives without increasing the weight too much like full length and width tang.
	If you check carefully, the base of the blade to the tang is curved and not straight 90 degrees, unlike the KaBar mk2. The buck 119 from the link post has even more pronounced curve, though still thinner tang. The guy advised me to not chop with his knives as they are not intended to chop wood. He made these from D2, which is one of the least tough steel but has long lasting blade, so not much of a reason to over build
I said it again and again, the stick tangs won't be as strong as full length and wide, I never deny that. Nevertheless they have their own advantage, they are still very durable for their purpose and very dependable.