In Vanilla FO3 Energy Weapons had 4 weapons in total. All big energy weapons were Big Guns. Yet EW was still a seperate weapon skill.
Ok I have dug out my FO3 and NV game guides. I will list all of the non-named versions weapons plus the ones that only have a named version. FO3 first:
Energy weapons (6 in vanilla fo3)
Alien Blaster
Laser Pistol
Laser Rifle
Mesmatron
Plasma Pistol
Plasma Rifle
No not enough to justify a whole skill. But Energy weapons are different enough to warrant its own skill and the Gatling Laser should be on here as well. 23 with all the "Named" and DLC.
Small Guns (15 in vanilla FO3)
10mm Pistol
10mm Pistol:Silenced
10mm Submachine gun
.32 Pistol
Scoped .44 Magnum Pistol
Assault Rifle
BB Gun
Chinese Assault Rifle
Chinese Pistol
Combat Shotgun
Dart Gun
Hunting Rifle
Railway Rifle
Sawed Off Shotgun
Sniper Rifle
That's more like it...but still kinda low. 34 with all the "Named" and DLC.
Big Guns (6 in vanilla FO3)
Fat Man
Flamer
Gatling Laser
Mini Gun
Missle Launcher
Rock-It Launcher (I forgot about this one)
Ok that is just low. Not Enough to justify a whole skill.
With all the DLC and "Named" weapons.
Drone Cannon (MSZ)
Drone Cannon EX-B (MSZ)
Fat Man: Experimental MIRV
Flamer:Burn Master
Flamer:Rapid-Torch Flamer (BS)
Flamer: Slo-Burn Flamer (BS)
Gatling Laser: Precision Gatling Laser (BS)
Gatling Laser: Vengence
Heavy Incinerator (BS)
Minigun: Eugene
Missile Launcher: Miss Launcher
11 in vanilla. A grand total of 17. Only 2 more than Small Guns without "Named" and DLC in vanilla. I think that justifies being absorbed into the other skills.