Those Arc jackets I've tried on looked and felt very nice, but were a bit "tailored" for my tastes — ok with a base layer and maybe a thin fleece, but no more — and they also seemed a bit snug around my shoulders. Jackets from other brands fitted better and have done a good job.
If you do go for a down gilet, have a look at some of the ones PHD do. I have one (can't remember the name) which is filled with 900fp down, and it really is amazingly warm for the weight. It's got a water resistant shell, so can stand a bit of condensation or drizzle. On-line only, I'm afraid, but a good British product and worth the wait.
Regardless of the meaning of "elitist", i like to think I've learned by my mistakes, but also from the mistakes and successes of others. They were willing to pass on to me the knowledge they'd acquired, and generally I like to do the same. There are instances I wouldn't, for example where I've seen rare or unusual wildlife, but, for me, the locations of potential wild camping spots don't fall into that category.