You are absolutely right. They still are, but on a much higher scale. Their striking power works in the same way as the likes of Karate Kid, Mantis, and the Fist North Star crew. These guys can hit hard enough to harm beings well above normal durability. Val in particular could make Pre-Crisis Kryptonians feel his hits, while his post-crisis version could rip the arms off guys that could take hits from Supergirl. He does this, because those are the types of martial arts he can do. All of that, including his judo tossing a speeding Daxamite lightyears away towards a red sun, is attributed to his martial art abilities. Mantis; on a lower scale, is the same deal, she can hit pressure points on the likes of Thor and other class 100 bricks, despite her lack of ability to even shatter a mountain. They are martial artists, their punches can do as much damage as the likes of Superman, but do not cause as much collateral. They did that even in Dragonball. Yamcha was just a street leveller when he first appeared, a skilled martial artist, but he was not even a CBPH in terms of strength and speed. Yet he knew a technique that can hit someone so hard they are sent through several thick stone pillars. Nam is another, despite zero training in the use of ki, his martial arts capability was at a level that he could make Goku feel his hits, and even give him a bit of a fight. Even Yajirobe, prior to being trained by Kami, was just another master martial artist that could keep up with the likes of Goku. The same rules still apply, as their ability to manipulate ki is also a martial art. Everything is just on a higher scale now.
What Goku, Val, Mantis, and whats his name from Fist of the North Star all share in common is their ability to hit a lot harder than the collateral damage around them(or lack there of at times) would entail.