Honestly, with Marth, you're camping with shield pressure, eventually, shields go down, and that leads to getting shield poked, and damage, especially when marth has so many safe ways to attack shield that come out faster then reaction time and can shieldpoke reasonably with for example, nair from above, or dtilt from below, shield pressure eventually forces them to act once they're in the "zone".
I think we're seriously going to have to figure out the distinction between pressure and camping if we want to have any kind of meaningful discussion.but that seems to be more like passive-aggressive pressure.
While, like in camping, you may not be taking the initial action in pressure, it is still a decidedly aggressive stance, which I feel that most forms of "camping" are very much not so.