Knowing that a lot of these athletes will take 5 years to graduate anyway, you'd think they'd rather make the most out of their 4 years of eligibility. But it letting someone play special teams or spot duty as a freshman, provided they are the most talented option available, let's us get them on campus for four years, that's fine by me.
And I do think that for most players, even playing on just special teams and spot duty makes their development move faster than it would if they were redshirting, so it doesn't both me as much that we're giving up a year when they could be full time contributors.