dividing index and a rotary table?

I was thinking about this because a few people told me you'd be better
cutting things like fan blades on a dividing indexer rather than a rotary
table. I'm not so sure since if the 4th axis might need to move continuously
as it cut more complex blades. Anyway... if you think about it a deviding
head uses discrete preset steps, and a rotary table uses a circle devided up
into 360 degrees, which is also in discrete (Non devisable) steps of 1 or
whatever degrees per line.

The rotary table can move between the 'discrete' steps it has marked on it
through a continuous range, meaning it could turn a nice smooth shape. The
draw back is the table's way of moving which means if you're doing something
like... I don't know... 17.85 degrees for one position, then you need to
advance 98.61 degrees, the maths is going to get tricky and annoying,
quickly. With the devider though, you can just crank the handle when you
want to move to a preset. I can see deviders being much more useful for
milling stuff like multi-sided rods (Hex extrusions etc). But I would think
a rotary table would be better under CNC for fans and the likes.

Thanks my thoughts anyway,
John H.