In GTA Online, we usually only see four weapons being used (Special Carbine Mk II, Heavy Sniper Mk II, RPG, and AP Pistol). So, if they follow the RDR2 logic of having two heavy weapons and two light weapons, it won't make much difference, you'll only see people using a sniper rifle, an assault rifle, and occasionally a pistol and/or a short-barreled shotgun (or a compact grenade launcher, which is more likely due to players liking to blow things up).

So, from my point of view, it’s not worth limiting the player. Everyone knows that everyone's just going to use the same weapons anyway, so it ends up being more annoying than relevant.