If you have looked at the perk list, is anyone else's builds suffering from some of these prerequisite?
Example; my wily "Lee Marvin in Paint Your Wagon" survivalist only uses melee, mostly thrown weapons, yet to get the Heave Ho Perk I need a 30 in Explosives, which I didn't plan on taking for him. Another one; my gun slinging (Liberty Valance-esque) cowboy was going to be Guns, Unarmed (for bar room brawls), and Explosives (for dynamite), yet to get the Cowboy Perk, I need 45 in melee...
Yes and no. Whenever I play Fallout, I don't try to follow any established archtypes (like "Cowboy" or "Martial Artist") - as far as I'm concerned, I was simply "The Vault Dweller" in FO1, "The Chosen One" in FO2, "The Lone Wanderer" in FO3, and now I'm "The Courier" in FNV - so there's no theme I have to adhere to. I simply decide what I want to be good at when I adventure around the wasteland and then optimize towards whatever I think I will have the most fun with. So I only take perks if they will reasonably enhance my build and not based on their actual name. If they have prerequisites I don't care to meet, I just forget them.
In FNV's case, since hardcoe mode means healing is going to be harder, and that ammunition is going to have weight, I'm building a courier who is going to try to make every shot he takes as effective as possible by giving him the highest chance to hit and get a critical with each shot, and have a decent enough medical and survival knowledge to heal himself and stay alive after a fight. I build the character first before I go back and declare if he fits into any archetype. In my courier's case, I'm thinking about writing up a history of him being a professional gambler since it fits in so well with the New Vegas casinos and overall theme. Since I'm setting his luck stat so high to get as many critical hits as I can, this has the added benefit of affecting my chances at the casinos - hence where the inspiration for being a pro gambler came from. His knowledge of guns and survival came from just having to survive out in the dangerous wasteland on a day to day basis, while his medical knowledge came from having to patch up all of his comrades he roamed the wastes with.
I do the same thing whenever I game at the tabletop with paper-and-dice RPGs. Though, doing up the numbers first AND THEN writing a character biography AROUND THAT seems to be an unforgivable sin amongst a lot of role players for some reason, so I never state that I'm doing so out loud. Oh wait... :bolt: