Changing numbers in the system always changes things. Whether it is huge or small change.
One example of why the age requirement should stay:
In America 16 years of age shows gives a lot of things in life. Federal law appoints you to be able to drive, and you're also considered an adult in the court system (which is pretty big). You can make more decisions as a 16-year-old, compared to someone who is 15 and below. This alone gives more reason to raise the bar on the age requirement. Assuming that when people submit ban appeals/request, member submissions/protests, or participate in the community in general you'll have whole different range of debate. Meaning that things might actually be done with better responses, instead of a shotty reason and a "+1".
Also statistically, 16-year-olds are more mature than humans that are below the age of 16 in a general population. You can't give a rebuttal with examples like Kypari, Tekage, and Shogun Yao. Them themselves in the general population of xG aren't a large enough number of people to really pull the age requirement down. Essentially they are the one percent.