Service intervals

I watched the video about the new Gen3 tundra . There was one part that caught my attention , the narrator stated that with the gen 3 turbos that we should use the extreme service intervals .
Which is 5k oil and filter change
15k mile front diff change
30k front ,rear diff and transfer case change
60k trans flush
I just did a blackstone test on my engine oil at 14K miles , it all came back within tolerances and levels . I change my engine oil every 5K miles .
I do the tests just so i can head off any issues ,
I test my porsches and the one that usually has some items out of normal is the Cayenne which gets changed once a year on 10 miles .
The 911 gets changed once a year , but less than 5k miles on oil is always in better shape.
My question is about the front diff service ? Why would the front need changing sooner than rear ?