For me, it's mostly about not having some 'lube tech' who is in a hurry, strip or cross-thread fasteners, or over-tighten the filter cap, etc.Don't you get 2 years of free Toyotacare maintenance?
edit.
I just asked the service writer if they'd give me the oil, oil filter, and drain plug gasket, as I had already paid for the 2 year 25K 'Free' maintenance, in the price of the 4Runner. He agreed.
It's possible that having bought the 4Runner at this dealership, and knowing the service manager when we both worked at a different Toyota dealer at one time, may have influenced their agreeing to do so.