As long as it's clear that "tutorial overabundance" and "player freedom" actually aren't inherently related (as in, you could have way too many tutorials sprinkled throughout an open-world exploration game, or you could have no tutorials at all in a very linear game), I think it's definitely an interesting idea to compare how the series has progressed in terms of the amount--and necessity--of tutorials, as well as the overall linearity. This gets an approval from me.