Not sure that I care for the rule. We used to wrestle a program that had kids wrestling varsity until they reached the redshirt max of matches/dates and then magically "redshirted" these kids, who had no injuries whatsoever. Seems this allows a coach to throw in a promising redshirt guy to tide the program over for almost half a season (some teams only play 10 regular season games) until a starter returns from injury. Not what the intent of redshirting is or ever was. Seems this was done to help coaches milk more eligibility out of kids. JMHO
The rule only applies to D1 football programs.
I know most P5 and G5 programs play 12 regular season games.
Other D1 programs seem to play 11-12 regular season games.
It seems that the rule change is aimed at larger programs where it would be equal to of their 1/4 regular season games.
It would seem that the rule could be tweaked to be 1/4 of any D1 school's regular season games.
The rule does permit the 4 games to apply to regular season,bowls or playoffs and they don't have to be consecutive.
This could help some programs where top players skip bowl games to avoid injury before the draft.
I do see some benefits,especially in sports like wrestling where guys get "dinged" all the time.