Honestly, I haven't been using them since they're incompatible with a stealth build. I'll go test them though.
In previous games, sound levels of laser weapons have been marked as quieter than their small guns counterparts in the game files. They weren't silenced, but enemies would have a harder time detecting you because of the way the AI works. I'm assuming the same here.
Lame is when laser have sound and recoil when it's just very powerful flashlight.
Yeah, I'm not hearing any difference in the v1.4 laser sounds.
OP isn't talking about the sound that you, the person playing the game, hears. He is talking about the perception of enemy AI being able to detect the firing of the weapon.
Like I said earlier, in previous games (and I assume FO4 is similar since it really is just an updated engine), weapons have a "sound level" entry in their respective files. For instance, most melee weapons are set to silent, a missile launcher is set to normal, a .44 is loud. The ability of enemy AI to detect where you are as it pertains to the "sound" of a weapon being fired is based on their proximity to you and that setting (as well as their PER stat, your perks, etc.).
Whether that sound level has changed for lasers in the most recent update I'm not sure.
Laser weapons in Fallout 4 are powered by micro fusion cells, not generators. You can look up hand held laser rangefinder and tell me how much noise it does. None.
Laser weapons might not even fire actual lasers, or the mechanism they use creates recoil and noise. I see two possibilities - laser is a misnomer, and laser weapons actually fire a weaker, faster beam of plasma (the Laser Musket definitely isn't a conventional laser, it's more like a red lightning bolt). Or, laser weapons work by creating an explosive reaction within the barrel of the weapon which produces an intense light, and that light is focused into a laser out of the barrel.
Okay, third possibility: It's a science fiction setting where we've got fusion powered cars, portable Miniguns, Mini Nukes, super mutants, ghouls, and scorpions the size of cars, and the laser guns having recoil and noise is bothersome?
It very much do matter. Because some machines, like power cells, does not generate sound. Nor do they generate recoil.
Besides no machine can create recoil on it's own. For recoil to be created something with the mass have to exit machine in the opposite direction. Laser beam does not have mass which you would be able to notice (it have extremely small mass which is noticeable only in relativistic physic).
They are obviously called laser weapons for a reason. And it's not because they fire plasma. How do I know that? Well because there are plasma weapons in game too.
I could. I could fire a soundless, recoilless laser weapon and be happy as a clam on the mudflats at high tide- because I know that's the way it's supposed to work, and realistic weapon physics appeal to me, regardless of whether they go 'bang' or not. If I want bang>kick, I'll fire a projectile weapon, which is supposed to go bang>kick. Firing an energy weapon in Fallout that sounds louder than a .50 anti-tank rifle and kicks like a mule, makes me not want to use them.
There's no way it can create recoil without shooting something with mass in the opposite direction. Photons does not have mass (for this purpose).
As for noise generating "machine", what exactly that would be? It's not like construction of laser devices is unknown mystery. We have concluded that laser weapons are not powered by generator. Is that noise generated by pulling the trigger? Probably not.
Btw, laser beam is invisible in the air. Another unrealistic thing.
All in all, we can safely conclude that attributes of laser weapons are the same category as irradiated water, left sided bolts on right handed guns, infinite reload legendary guns and other nonsense included for effect to appeal to casual players and counting on their ignorance.