Nothing I've said makes it seem your display will explode if you don't run slides.
Watching a letterbox film on a brand new plasma in the first hundred hours of life is not something any professional will recommend. In fact I've seen manufacturers directly advise against this. It doesn't matter whether you watch other content or not, letting black bars sit for hours at a time at this stage is irresponsible, but ultimately your own choice. This is decidedly not "common sense", which I find quite interesting considering the source. What you're arguing is who cares, as long as you vary what you watch, static content and black bars for hours at a time is just fine during the initial hours of a plasma's life. Because of that, I can go through that period as slow as I like.
Well, most of the rest of us are a little more cautious about what we do during this period- and there's really no reason not to play it safe when it only takes a few weeks. I think you'll find that if you stretch this few hundred hour break in over the course of a few months most folks will get antsy and starting watching material they probably shouldn't at that stage. Lo and behold...
Running slides gets you through that initial aging faster, period. There's no arguing this, there's no "whatever makes you comfortable"- it is what it is. There's no magic, no personal opinion that it "works" or doesn't. 100% of the time, it will get you through initial aging of your panel faster. Every time.
Either you want to take months to do this, or you'd prefer to do it in a matter of weeks. That's all there is to it.