Presume you meant a fleece sleeping bag liner? You've got tents on the brain
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Unless you're a hot sleeper I rather think you wouldn't find that warm enough in place of a sleeping bag, except in a heatwave, and we don't get many of them. It can get quite chilly in the small hours out in the countryside, even in summer!
Are lighter pegs worth getting to save ounces? I'm biased, I'll do anything to save ounces! But unless your new tent comes with particularly heavy pegs you probably won't find much difference. I replaced the alluminium ones with my Zephyros because they were nasty cheap, sharp things, but I was surprised to find they were lighter than titanium ones.
I'm happy to leave camping mixed in with General and Gear boards as it is now. This is a walking forum and we are walkers who camp, carrying it with us. A general camping thread could pull things too far away from walking and towards static camping (is that the right word?) and 'family camping' for which I expect there are already specialised forums. Just my opinion.