This is all both trail and bike dependent. Pro-pedal comes on a variety of suspensions, first of all. In my experience, where propedal can be a negative is while climbing on steep-er loose trails, because the propedal can rob you of some traction. In situations where people would think they would notice it more, like climbing bony trails, it seems to either matter less or be a benefit.
Most people over time smooth out their riding and also learn the benefits of a little bob, if they both ride regularly and have a focus on the downhill part of the ride. So, if they are actually attentive to things like running propedal, they may use it less.
It will help most people to have propedal on most bikes. While most riders will play with it a few times and then forget about it, it will also benefit anyone to play with settings a lot, along with getting used to the other aspects of their suspension. This will also help them develop the subjective thing known as bike feel, which is in a way much more important than the fine print of their suspension design. All suspension designs have trade-offs, and the fact that some benefit from propedal doesn't mean they're inferior.