Edges should be rolled into a class is short sighted, because taking those edges means giving up on others. If they are rolled in you can take the others.

Personally I like the edges. The more the better.

However, I would let people go down one of 2 routes
Either pk for your edges, or explore and obs. The latter has the higher cap (since you are taking time out of pk). You can only do one.

A pk'er will probably take the pk option because it lets them pk non stop.

I actually like the challenge of taking a pk class (eg ap) and trying to successfully explore with them. One of my favorite memories is exploring the volcano midbie area with a suboptimal group.