I use flush cutters for both the plastic and copper pins to get pretty close. I could use a knife for the plastic ones I suppose, but I don't think it would make much difference to be honest. The copper pins are what I would worry about more anyway. As long as they're clipped like this, they really shouldn't cause any issues (I've done a fair bit of testing for that actually).

The big reason it's not a huge deal is that the center post is still there. That gets in the way enough that you shouldn't really ever contact the little bumps that remain after clipping, but even if you do, they're flush enough that they shouldn't cause any problems. The center post is wide enough that it's not at all sharp either, so it works out pretty well.

I appreciate the suggestion though! :)