If one goes into martial arts knowing it is a lifelong pursuit -- no end, no stop, always more -- then it becomes utterly irrelevant when or how often one gets red stripes. Perhaps the waiting time for stripes is designed to reflect that idea. If it takes a bare minimum of 54 years to get from 1st to 10th (using the plan of waiting an equal number of years as your next rank), then one has a goal to take them into retirement.
If it starts taking, say, 20 years to go from 1st to 10th, then it doesn't seem so much like a lifelong pursuit. Martial arts becomes more like a modern career, to be followed for a while until you can't go any further, then go find a new career.
Besides, if someone proclaims to have mastered what takes at least a lifetime for the great students to master, except in only 20 years plus time as an underbelt, that's pretty friggin' cocky.
No offense if someone has done this. Well, no personal offense. I guess you could construe the non-personalized categorical statement that such a thing is awfully cocky. However, in martial arts -- despite all it's supposed lessons about humility and being forever a student -- being called cocky is somehow usually seen as a compliment. Sigh.
Maybe by the time I get to black someone will convince me that humility = thinking I am da' *****, too.
Peace,
Scott