Not sure if it has been pointed out yet but here is my 2cents.
There is a real difference in the fibers. Alpaca is a hollow fiber versus the solid fiber of wool hair. The hollow alpaca hair will wick far more moisture with capillary action and can store more insulating air than wool. This is why a thinner pair of alpaca socks can be as warm as a thick pair of wool socks. Both Wool and Alpaca have a rough jagged exterior surface which inhibits the growth of bacteria the same way rough jagged terrain slows us down in the back country. Nylon and polyester have smooth exterior surfaces. This makes it very easy terrain for bacteria to spread, hence the funk.
Alpaca is often more akin to standard wool in ichiness than Merino wool and to get around that Alpaca needs quite a bit of processing to soften it.
People just need to pick the % that work for their application. Loose fitting boots, heal lift in boot, dry cracked feet - a higher nylon count/lower wool count will hold up better. Personally I find 85% wool to be the best balance for me in durability and warm/anti-funk. Different lacing techniques can cure the heal lift and many people could benefit, or at least the sock life would benefit, from a belt sander or pedicure.
100% natural fibers can be warmer, last longer without funk but I hate socks that fall down so 3% spandex is a requirement like cruise control on a new vehicle. A little bit of nylon will also make the fabric more tear resistant and act more like ripstop fabric.
For comparison a 55% merino thick heavy sock from Costco is just as warm as a 27% alpaca compression sock from Paca's. When it is really cold I go for my 100% Alpaca socks from
Sabamba. While not my first choice of foot wear, I can wear these in air vented summer sneakers during the winter and even thoroughly wet in the snow my feet will still be quite comfortable. My preferred socks are from Farm to Feet for basic wool socks that are high wool count and quite durable.
I wear wool on my skin year round. FirstLite boxers all year, merino t-shirt under uniform if below 60* outside. No deodorant needed with merino wool shirt but with a synthetic or cotton shirt, sure thing. In fact I get far less miles (yes I measure my consumable cloths in mile) out of wool shirt if I wear deodorant a it seems to clog the wool and not allow it to breath and move against my skin. The armpits fabric wears thru really fast., When I take my boots and socks off at night I roll the socks off inside out and lay them over the top of my boot to air out.
35% wool socks are good for one day, funky on day 2.
55% are good for 3 days so 2 pair for the week. Typically Costco or Darn tough
85% wool are good for 7+ days. Typically FirstLite compression or Farm to Feet
27% Alpaca is a 1-3 day sock
100% Alpaca is far too warm for me most of the year but is good for 7+ days as well if allowed to dry out at night.
I just pick a thinner loft of fabric for summer over winter and never so thick if gets compressed inside my footwear.
Height of a sock is very important too. Socks should come up out of the footwear to dry out. Meaning there should be some sock above the top of the boot or shoe. I hear somewhere the average person sweats 1/3 cup of water a day WITHTOUT exertion. A cotton sock with hold water but does not wick it anywhere. The wool and more so the alpaca will wick the moisture into the fabric (off the skin) but also if the sock is out the top of the boot it will wick it up wards to dry out in the air. Wearing too short of sock with actually result in sweatier feet sealed inside the boot.
Remember though a low wool count garment will still look like a garment after most of the wool is worn out of the fabric. Cheap fabrics us the trash scraps that are held together in the fabric by the other materials versus actual 1st quality yarn sewn in. A Smart wool T-shirt for instance will still be a decent looing t-shirt after much use but when compared to a new one, the loft of the wool is long gone and the warm difference is quite noticeable. Cheap wool but still buy them if on a really good sale. The point is the good wool will fall out of a fabric and you will loose the warms, anti-funk and wicking natures of the fabric over time.
PS Bit of a sock snob because as a FedEx Driver my feet are crucial