Thank you for your detailed reply as it makes it clear you are passionate about saving weight. I was never disputing the lower weight of a Ti system, but rather the value to the average Raptor owner. When I spent months researching the mods for mine, the weight of my exhaust was never at the top of my list.
The MAIN thing most people care about with an aftermarket Gen 2 exhaust is the sound. If a Ti system could make our trucks sound like a V8, they would sell like hot cakes even at twice the cost of a SS system! The second thing people consider, with a much lower priority, is the performance. Since our trucks are restricted by the size of the turbos, a free-flowing exhaust adds little if any HP gains. If a Ti system added 40-50 HP, they would sell like hot cakes! (see the pattern)
The last thing I remotely considered was the weight. All other things being equal, if the TI system reduced the weight of our exhaust by some measurable amount and cost the same or very close to the same, people would buy them. (not like hot cakes, but they would get some sales based on the weight savings value alone) At $1K or $2K more, I think you will be hard-pressed to find many who saw enough value to make the purchase.
As you mentioned, the value proposition changes dramatically when you are talking about your experiences with the weight savings of a high-performance GTR. The cost can easily be justified to shave a few 10ths of a second off the track times of a fast, light car. If you have the money and can justify the cost for your Raptor, I say go for it!
I paid cash for my truck and all of my mods, so money was not an issue when I was making my decisions. In the end, I purchased a FlowMaster Flow FX replacement muffler for my truck for less than $500. It sounds much better than stock and is considerably lighter than the monster muffler Ford uses on our trucks. It ticked 2 out of the 3 boxes (none of them tick the performance box) so the value was there for me.