Having began my Tae Kwon Do journey in the mid 1980's, my Kwan Jang Nim is an ROK veteran, and distinguished martial artist from the 1950-60's kwan era of Tae Kwon Do. During the first 10-15 years of my TKD journey, my KJN was supportive of the Olympic movement, as most of the korean instructors were at the time. In fact, my KJN served as the Vice President of the USTU during the 1990's. He began to see the sport side detract from both the art and the martial science, in favor of manipulating the rules to win matches. It was after he left the olympic development movement that we saw punches to the head return to normal sparring. These days, all of the competitions we support allow scoring with hand techniques to the head. At the competition I host, we allow punches, back fists, and ridgehands to the body and head.
As far as the time frame training to own the skills required for 1st dan, and the promotion examination itself.. .
I think most have stated that the established norm from even back in the "old days" was 3-5 years. A disciplined person, with proper practice frequency, with attention to stance, rhythm, and focus, should expect to become proficient with the curriculum in 3-5 years. As for the test, it is only "hard" if you haven't spent adequate time preparing for it. "Brain surgery isn't brain surgery for a brain surgeon." The examination allows for you to demonstrate your proficiency under duress.
I think it's easy to look at organizations that are "different" and see their limitations, but I've seen the same limitations from older "kwan affiliated" schools, ITF schools, and KKW schools alike. I mean, I've seen it from karate schools too. When there is no governing body to regulate it, it is either up to A). each organization to govern itself or B). the consumer choice drives the market.
Organizations grow to a point that governing the standard becomes very challenging.
The consumer doesn't always know what they want. They see the black belt, and assume it holds everything they want. A black belt from one school means something totally different than it does to the school down the street.
Maybe it's time to bring back Dojo Yaburi to come back to popularity, it would certainly "take out the laundry." I jest, as we all know, in this day of litigation, storming your local rival school is fraught with liability!