Hanzou
Grandmaster
Definitely a learned competition strategy. Just one that I think the rules should be amended to reduce. To me, sitting down and waiting for your opponent is the epitome of "not engaging", regardless of the position ("guard") used. Pulling guard is one thing. Pulling it and just sitting there waiting (yeah, he scoots toward his opponent, but only when that opponent moves away - he makes no offensive effort at all to engage), is something different.
Why not simply learn to pass the Guard and smash the person sitting down? When you pass Guard you score points and arrive in a dominant position.
The reality is that there are grapplers out there who completely neglect Guard passing and just want to smash their way through someone's Guard.