Good stuff here. I am interested in seeing how the damage numbers compare with full smithing/enchanting/alchemy. BUT, without cross boosting the crafting skills. So no Enchanting Fortify Alchemy or Fortify Smithing and no Potions of Smithing or Enchanting. It is my opinion that the cross boosting is what is driving melee/archery sky high.
The plots in the OP show the damage resulting from maxed out smithing and enchanting, but no cross boosting. The ones I posted later on are the fully boosted numbers (alongside the no smithing or enchanting whatsoever numbers). And you're right, the cross boosting causes a huge, imbalancing increase, particularly the smithing potions (roughly +100% smithing, for about +10 base damage) and the smithing gear (+25% x4, for another +10 base damage.)
I agree with the point about 2 skill trees vs. one. Imp, have you taken non-smithed swords as your base? So: weapon + skill tree at 100 and nothing else?
The "no crafting" numbers assume that you're still wielding a daedric sword at 100 skill (even though finding one requires level 50+, which might not come until well after you reach 100 weapons skill.) I think its reasonable to assume though that your weapon is going to get better as your level increases, due to loot.
The fact that you
can boost your damage through other trees is more important than the fact that it takes more perk points to get your damage up as a non-mage. By the time I'm high level, I usually have perk points to spare unless I'm being "creative" with my build, and trying to max one handed, destruction, restoration, blocking, armor, and crafting or something. Going pure mage leaves you with tons of points and nowhere useful to spend them. What would be nice would be if enchanting could boost destruction damage, and if there were a magic buffing skill anologous to smithing. Like spellcrafting maybe.