the real question is... why split wood at all?
we always throw in the whole log
My firebox can take a 24" X 10" log ... I useually cut 'em 22" out in the woods.
Anything 10" and smaller in diameter gets stacked as is and I NEVER split ANYthing so small ... there's plenty of kindlin' from the limbs that we DO gather and use.
Larger diameter logs will be split to as closely match that 10" diameter as possible.
Around 11PM, I stack my firebox, (which, btw, is sunken from the loading door so I can fill a 10X24 firebox), damp everything down and go to sleep for about 6 - 8 hours (older burner, a few leaks, etc.), and awake to a nicely warm to hot bed of coals.
That guy must be a craftsman making pine splits he'll shave to make bird houses ..
/8^)