I haven't been following this thread and its various "political" nuances, but have some thoughts on seam sealing tents.
What a lot of people either don't know or forgot is that until a few years ago (10 or 15 years?), no tents came seam sealed. If you bought a tent, you had to get out there with your seam grip and seal it up. Marmot, Sierra Designs, Mountain Hardwear, Moss, whoever. So this whole taped-seam thing we see now on the market is a new development. Most people I meet on the retail end still expect to seam seal their tents, and are pleasantly surprised to find out that they don't. Setting up a tent and spending even an hour sealing it is no big deal. It's part of a process. It's taking care of equipment. Do you dry your tent when you get home from a trip? Seam sealing is the same kind of thing, except you're only going to do it once. Frankly, I always kind of enjoyed the process. "Getting all my ducks in a row," as it were. More hands on, less hands off.
As I work on prototypes for a prospective gear company I'm trying to figure out what kind of approach to take with tent seams. Large-scale manufacturers are taping their seams. To be efficient in doing that you probably need a $5 million dollar machine... or I could sit there with a mini iron for a few hours taping each tent... or I could just let people seam grip their tents. One thing about sealants: there's no way to get them on perfectly, the presentation doesn't say "professional." Not like taped seams, anyway. So if I did use something like seam grip on a commercially produced tent, I can guarantee that customers would quibble about the smoothness and quality of the application. And that's fine, but it's not something I want to toy with. There is also the implied cost differential between US labor and Chinese labor, along with the time investment itself, and the equipment investment in sealing the seams. In other words, the cost of producing a tent in the US is greater anyway; if you further add cost of taping seams, the cost of the tent will go above what most people are willing to pay. I don't think it's a stretch to say that a process like taping seams could add $50 to a tent's bottom line. Is it worth that much to you?