Energy weapon ammo costs 2-3x as much as normal ammo while doing around the same to lesser amounts of damage.
Not true, damage wise Plasma Pistol > .357 Magnum.
More damage per shot, more damage per second, and it can fire 16 times before reloading unlike the revolver, and the plasma weapon has a higher critical rate. Its still a cheap weapon so there should be no trouble paying for repairs if replacement parts are in short supply. And both weapons are early game.
A plasma pistol is durable enough to say wipe out the NCR prison
The laser rifle deals comparable damage to the marksman carbine, more damage if its upgraded and you optimize your critical rate. Not bad for a weapon available as early as Nipton. Vs a high level gun runners weapon.
For late in the game you have the AER14 laser rifle 36dmg a shot [40 with laser commando] and a x2 critical rate. Nothing like a highly accurate semi-automatic weapon that criticals 70% of the time or more if you've built your character right. [high luck, bones hat, finesse and of course laser commando] That's without using overcharged or maxed charged ammo.
Not to mention how rare energy weapons and their ammo is in the game.
Once again not actually true most of the ammo vendors also carry energy ammo now and you can convert ammo back and forth to suit your needs.
Do you even have the 1.2 patch?