My apologies if this has been discussed previously -- searched but didn't find anything.
There is often a ribbon of relatively thick nylon sewn into the draft tube of many down and synthetic insulating jackets that seems like dead weight to me, since if I ever have concerns about snagging I typically just hold my thumb against the bottom of the zipper pull as I pull it up and never have issues. The Patagonia UL down jacket has 2 parallel vertical seams running the entire length of the draft tube and no such nylon ribbon, and it has never once snagged despite lots of careless urban handling. The Montbell UL down jacket takes no anti-snag measures on the draft tube whatsoever and its zipper didn't give me any trouble either. The Paty Down Sweater and MH Hooded Phantom, by comparison, have the nylon ribbon I speak of. However, now that it's on there, is it possible to close up the stitch holes after removing it so the down doesn't all leak out of it?
The second feature that I am itching to remove is a large panel of the face fabric sewn in across many baffles, e.g. chest area, sleeves, or entire jacket. I understand this liner fabric might add a tiny bit of wind resistance and protect the baffle seams from snagging, but I am already carrying a wind shell for those purposes! I have trouble believing that it does a whole lot to prevent convection if it's on the inside of the jacket since it's probably just going to be resting against the layer beneath it anyway. A number of Patagonia puffies have the zippered inner pocket/stuff sack sewn directly into this liner fabric, which I never use, so removing it would save even more weight.
Are these modifications reasonable? Will I be losing any functionality I didn't think of?