Yes context is important.......so maybe we have a couple of categories.....UL road touring and UL bikepacking and give bikepacking an extra 10lbs for the weight of the 29er and the iodine
Heck, I'd say 5 pounds at best. Right now, my aluminum 29'er is almost as light as my road bikes and a friend of mine has a FS carbon 29'er that weighs 19 pounds.
But this is a valid point. I think UL road touring is going to have different demands than bikepacking. I just did some of my list for next weekend. Just taking two 29'er tubes is nearly a pound.