"If it were really that good it would allready have them" is no argument. I can't tell you why it wasn't in. Maby [V] hasn't thoguh of it. Maby they like the Command is stoopid idea so they design stoopid ships to go with it.. I don't know.
It's no arguement you can answer, yes.
So you're basing this on you having a better idea of the rules and restrictions of FS than Volition? Essentially, your arguement is 'everyone is stupid but me' here, including the people who developed the game and decided what was sensible to put in (I'd wager they thought a beam-cannon-with-an-engine would be effectively a pointless addition of what amounted to a single gun cruiser), and that doesn't fly unless you want to scrap every ship, weapon and piece of tech in Freespace canon and make Trashspace instead..
Simple - since they are used everywhere. If every ship has those (and they have them now) then they can't be that expensive or complex.
Insystem drives are allso on every fighter. If they really were are so expensive only select units would have them (like inter-system drives).
the GTVA can afford thrusters, engines and jump drives on all fighters... It only makes sense they can afford two of those components oin something bigger and more expensive too, right? (unless you think a fighter costs more than a RBC..)
Within context, computers are used everywhere. Jet airliners are used everywhere. That doesn't make them cheap, or simple. It makes them cost effective for the task (or simply the only solution). And a fighter may very well cost more than an RBC; I suspect it does, even ignoring the pilot training cost, because it's a versatile, fully autonomous vessel with things like navigation, jump drive, long range comms, ability to rearm, life support, modular weapons and ammo storage, rearming systems, etc. I'd venture it could be compared to the relative cost of, say, a stationary AAAf cannon (this is admittedly tough given the highly reusable nature of an RBCs' armament) versus a Jetfighter.
So you're saying "if the GTVA has better beams why aren't they mounted on all modern warship like Deimos?"
LOL.. the collie is one of a kind... any new beams would be tailored specificly for a ship of it's size and tech level..
Or do you think they mounted the best guns on every new warship, or do they mount cannosn that are best suited for that specific ship?
Do you think suitability for a purpose contradicts 'best available'?
Unless the GTVA deliberately underarmed the Colossus, it has the most powerful and best weaponry the GTVA has to offer, simply because its role dictates that. So if it's not got more powerful weapons than the Orion, the GTVA simply doesn't have more powerful beams that it could use on the Colossus.
If the Colossus has more powerful beams, then the GTVA does. If it does not, then the GTVA does not have more powerful (ship-mountable) beam weaponry. Hell, LRBGreens strain the Colossus' reactors and superstructure, after all. There's no way you can upgrade the armament of it without upgrading the whole ship, or it'd melt every time it fired rather than just when it pushes itself as in High Noon.
Not ignoring the rather uneconomic & tricky nature of weapons designed for a single ship class, which makes repairs trickier and more expensive as you need to have a prefab parts supply rather than, for example, reusing common component designs across vessels and having a common store in the supply dump/s.