I don't own a pair of of actual weight lifting shoes, but they all seem to have an elevated heel. they are not flat like Chuck T's. The idea, from what I know, is that a slightly elevated heel during a squat, will reduce the ROM of the ankle, allow for greater involvement of the quads during the lift. I don't see much difference between squatting in a flat soled shoe, and barefoot, regarding the flat surface to push off. It seems both styles are at a disadvantage, compared to an actual weightlifting shoe.
The other problem is stability. A running shoe, has too much cushioning, resulting in a loss of stability, as well as force being absorbed and not translated to the floor.
If I was a competitor, and was attempting to break world records, then I would buy a good set of weight training shoes Just like if I was a sprinter I would run in track shoes.
I like squatting barefoot because I feel the flat floor makes it easier for me to keep my weight back over my heels. Also, my toes are jacked and feet are jacked. After all these years of wearing shoes all the time. I feel like the muscles in my feet simply don't function as well as they should or could. My little toe is tucked under the other. I feel that wearing shoes in general, reduces the function of the feet and constricts the development of the "feet muscles", tendons, and ligaments, pads. As much as I hate to say it, high heels are probably the worst.
We didn't evolve with shoes on our feet. No other animal that I know of, straps something soft to the sole of their feet. They simply adapt to the stress of the walking/moving. Human feet are a great design for us too. We have these digits that can move in all sorts of directions, can grip things etc. It's too bad that we wrap them so tight all the time, the essentially become a hoof. Which usually is a good thing for an athletic competition.
An easy comparison is between footwear, and a weight belt. Sure, you can lift better and perform better with the proper belt, and the proper footwear, but wearing a weight belt as often as you wear shoes will lead to some core problems.
Since the feet are our base, any issues we have with our feet, can effect(affect?) parts of our bodies further up the chain as well.
Since I have started squatting barefoot on occasion, and going through some mobility warm up exercises barefoot, I feel like my feet have gotten stronger, and that I have better control in the function of my toes, and ankle, as well as increased stability. However it's been less than a year since I started this, and I would say I only do this once per week.
Great you all probably think I'm some crazy barefoot fool. I don't have shoes on right now.