Strength: Companions can carry things for you. Plus, there was power armor and food in NV which allowed you to use heavy weapons. No much importance right now.
Charisma: Only really important in 1 and 2 (as far as I know). Speech the skill was more important that being charismatic by fallout 3 and NV (since they cut that part of the charisma stat).
Endurance: Play Fallout New Vegas with Med-X, Slasher and Battle Brew, and see if you really need that ten endurance. Add DT on top of that for good measure. Not to mention that sniper should have no problem NOT getting hit in the first place.
Intelligence: Skill books takes care of some of the skill points, so more room combat perks. Plus, Skilled is a trait in New Vegas so it no longer factors into it. Also, 3 and NV have a limit of 100 which is about 5-10 levels of pumping ALL skill points into one skill to max out (for tagged skills).
Agility: this is a problem only if using VATS by the time of 3 and NV. Not needed as far as we know right now.
Luck: Good for critical hits, not needed for Explosives, a skill that has NO benefit from high luck.
did I miss anything?