I didn't find any ambiguity in Brad's statement; it was my interpretation that he meant planetary exploration is going to play a much bigger role as an action gameplay element than it did in SC2. Whereas melee was the primary action element back then, planet exploration was by comparison a mini-game. All of the elements of using the lander on a planet's surface were like a very simplified version of melee.
I believe Stardock wants planetary exploration to be just as engaging and action-oriented as starship combat. Which I think is great. Several posts have gone back and forth recently discussing how many stars and planets should be in the galaxy, and it was suggested in several cases that there comes a point where players eventually tire of exploring and grinding just for grinding's sake. Well, if Stardock can add value to the planetary exploration dynamic and make it just as fun as melee, they are on the right track. Having a wide variety of life forms to encounter will go a long way towards that. One of SC2's few drawbacks was a serious lack of different lifeforms on planets.
I think this is a big part of the reason why so much of the early concept art focused on having such a diverse variety of planets and environments; they want planet exploration to be interesting and replayable as an action mini-game in and of itself. The planets in SC2 were completely featureless and well, I'm sorry to say, boring to traverse. If they can execute on really bringing a variety of worlds to life and having combat with life forms be just as interesting as combat in space, I think people would not mind going from one planet to the next over and over again because it will seem less like a chore and more like a game.