I would say the incremental value of BG1 as a plat is highly dependent on your travel patterns. If you're flying hub-hub at peak business travel times, BG1 is almost a necessity. I also personally loathe having to stash my bag in the back of the plane and then fight my way back to my seat, then back to my bag. Other people don't seem to run into this issue, but I have been in the first 4-5 people of BG2 as a Gold and been one of the last ones allowed to carry a bag on before they started forcing gate checks.