I wear wool extensively. I have never had it shrink from getting wet in the field. Let it dry, maybe block it ( gently pull it) a few times. I have had it on in the field and gotten soaked. White out rain storm soaked. The worst time I was out for 2 days. I wore the clothing until it dried. No shrinkage, no cold. My wool clothing requires A LOT less maintenance than my bow, wood arrows, feather fletching, and shooting glove.
Burrs...for whatever reason, they don't bother me. I get them.....heck, I hunt mostly in Michigan. But I just pick them off. Those lava rock burr removal thingys work well. But if my hunting clothes have a couple burrs, I just don't care.
The pros of wool waaaaaay outweigh the cons. It is warm, yet comfortable in a wide range of temperatures. It truly is warm when wet or damp. I know this, I'm not just recycling what I have read.
I feel extremely camoflauged when wearing a subtle wool pattern It absorbs the light, it is SILENT (a significant component to the camo concept). It isn't bulky. If it is, it isn't a garment designed for bowhunting. I have some Filson Mackinaw coats. They are of awesome quality, and I like the style. But they are designed for timber cruising, not shooting a bow.
I also wear a wool sweater a lot these days. Remember how hot they are when wearing one to the office? I do. My wife cringes when she sees me wearing an expensive merino wool sweater as a hunting garment...I almost delight when I have a good sweater get a hole or stain.....because now it goes into the hunting pile
I never feel like my wool is too heavy. If I am wearing heavy Filson gear, it is cold enough that weight is my last concern. Most of my hunting wool is Asbell pullovers, zip ups, and vests. I also have a lot of the good old Woolrich shirts. A REAL cold day on stand might find me wearing merino wool long johns, a wool sweater, a Woolrich shirt , and an Asbell pullover or zip up. I will throw a vest in the bag as backup. I never get cold. If I am moving I would drop the sweater or shirt.
I don't find that wool retains odors anymore than other fabrics. I don't smoke, and I take reasonable care to stay out of stinky, smelly places regardless of what I am wearing. I care for my hunting clothes by wearing them, airing them out, and washing them if they are dirty. Wool or cotton.....the outdoor breeze deodorizes them better than anything else.
When I was stationed in Germany, we were issued crummy GI cold weather gear. Mostly quilted cotton stuff. The first thing I did was send home for my wool shirts. Somewhere I have a picture of myself in the field. I stand out from the crowd, because I am the only guy with a buffalo plaid wool shirt peeking out from under my bone chilling cotton field jacket.