I actually have two PCs with very similar builds that I draw comparison between. The earlier one was 14 con while the newer one is 12 con, basically I decided to sacrifice 2 con in order to have a greater dex bonus this time around. Anyways, comparing them both at level seven despite the fact that the newer one had a d10 hp roll class replaced with a d6 hp roll class, their hp is pretty much virtually the same. Essentially, for that I agree with those posters that believe so much is left to luck in this regard despite the fact that stat points and even a feat can be invested into more hit points. That being said, I could argue for either side. However, regardless of which I decide to argue for, I can't deny the fact that static hp rolls would make things more balanced in the end. Anyhow, sorry for writing too much.