We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Exercisers generally want their barbell squats (or even their air squats and goblet squats) to get the butt as close to the floor as possible (ass to the grass). That is, lower than parallel (the photo shows a great example - that little gal is stronger than I am or will ever be but, in a half-hearted defense, shorter people have an easier time with squats because the range of motion is shorter. Same goes for bench press with smaller people - shorter levers).
I am working on lowering by using gradually-lower box squats and lightening the weights. It is always too easy for me to find my sticking point after a few reps and then I lighten the weight.
Why bother going below parallel? Because it's another tough challenge to take on, and because it stresses all of the muscles involved in squatting even further. Stresses willpower too and we all need to strengthen that. That article doesn't even cover all of the accessory muscles involved in balance and core stability. Total body stress including your heart which pounds like it is at the edge but what doesn't kill ya makes you stronger, I hope...and you could do worse than croak on the gym floor.
I am thinking that I ought to do lighter-weight deep squats once a week, and my usual almost-parallel squats once a week. I have weak quads even after 2 years of this, relatively-speaking. I know we have a few powerful squatters at Maggie's, though.
That video is about how to squat (low bar) optimally for the sport of powerlifting. It is not addressed to a general strength and conditioning audience.
The person he refers to (Austin Baraki) is a "Starting Strength Coach." The Starting Strength folks support using a low bar squat with a wide stance as optimal. Many others disagree and believe that high bar (A2G) is better for general trainees.
Where you come out on that debate doesn't really matter though with respect to squat depth. The Starting Strength folks still squat lower than 95% of the general public. They still go below parallel, they just don't go the absolute lowest range of motion. That is the key takeaway here.
If I were you, I would just do deep squats exclusively for 3 months, then reassess. If you want to get better at them--and you should, as you correctly point out--then you have to practice.
Something that has helped my range of motion considerably has been to sit in a deep squat position for as long as possible with just my bodyweight. Not as part of workout, but just at random times throughout the day. At first, you might only get a few seconds. Shoot for 30 seconds without too much discomfort, and you'll be in good shape.
Hitting squat PRs is a great feeling, and there's no exercise that offers more bang for the buck. Happy squatting!
I just started CrossFit a month ago. Last Friday our metcon started the first round with 80 body weight squats. The most I'd ever done in a row before was 25 or so. The volume is just insane and it's kicking my ass thoroughly, but I keep going back... :-)
This from a guy that 10 months ago would have struggled to do 10 body weight squats. Hell yeah!
I used to train seriously and would go a couple degrees below parallel with heavier weights, up to around 400. Pushing 50, I do 4x or 5x10 with much lower weight, 185 or 225 depending on how I feel, but much deeper now, as low as my legs will go, ass hitting my calves. The huge strength gains of my yout aren't there but I'm not looking to mash somebody on Saturday afternoon. What I am getting instead is greatly improved hip and lower back mobility and balance, and my arthritic ankles and feet are much better. and because they seem to be helping my arthritic ankles and feet.
Cautionary notes though. Mind your knees if you do this, things move around in that joint when you do this. Nothing has been injured so far but I have an ex-athlete's feel for when I am getting close to an injury and deep squats give me the vibe that inattention to form or overdoing it could cause a big problem. YMMV. This exercise, particularly in combination with deadlifts may sharply point out any flexibility problems, longstanding unhealed muscle tears, bulging discs and other random problems between your ribs and toes. I recommend getting a hard roller, and using it to do some deep massage on your quadriceps and hamstrings after doing these. I was getting back spasms around a bum L4-L5 disc, which were in turned caused by some old quad injuries the deep squats had stirred up. It seems there are four heads to the quadriceps, only one of which is really stretchable, and the quad tightness is a potential cause of lower back spasms... The things you learn when you're gettin' on in years.