Currently, only lasers have enough tech levels to let your racial weapons level keep up with racial armour level at maxtech, meaning that to fully upgrade your ground weapons, you have to fully research lasers.
Specifically, lasers have 12 levels, particle beams have 11 and both railguns and plasma carronades have 10.
I'm suggesting that the tech branches without 12 tech levels either have some techs introduced to make 12, their racial weapon level bumped slightly so they reach the same racial weapons level at maxtech, or have racial weapon level based off of the capacitor recharge rate tech, since that's required for all of the primary energy weapons anyway.