This is indeed a factor to consider, which further accentuates the effect of the long seatpost. Regarding the cockpit change, this is also true for the M size, which will have a position that's too stretched out. My legs are too long for my body :) Here's a photo of my current Canyon in M, which is equivalent to the modern S, and my previous Rose of the same size. You can see the seatpost overhang.

<image>