Yup, I've been eating super hots for a number of years now including fresh Carolina reapers. They simply don't hurt at all when I eat them and honestly, getting past the heat really brings out the ability to taste the flavor and I can tell you from experience, if you are experiencing pain, you aren't tasting the flavor.

For anyone picking up the hobby, know this, you will reach the point where your stomach and other parts of your body will become a limiting factor so build up slowly. I own a bidet.

Exactly that's why it's common in Mexican recipes to leave seeds, it's a totally different experience to eat Guacamole with and without pepper seeds.

To my understanding, capsaicin is in the flesh around the seeds, but the seeds themselves are not spicy and tend to add sweetness. Is that correct?

I too have read that, but my experience is completely different. Nothing burns like the seeds.

That jibes with my experience. Leaving the seeds in seems to create a hotter dish.

AFAIK, the seeds tens to be coated in the oils from the surrounding flesh and bring heat for that reason, but less than the ribs themselves. I don't think there is heat in the seeds, but that's something of an academic distinction in most cases.