I do not wish to be rude, and I respect the opinions here, but I do have to disagree with the above. The game map is not, I repeat, not to scale. That may seem ridiculously obvious, but it can be overlooked at times. That ship or fleet might look like it is sitting right next to the starbase, but they are separated by a parsec. In order for a starbase to fire upon the ships in the grid next to it, without using movement, would require it to aim its weapons and fire them at a target that is a little over 3 light years away from it.
Yeah, so? You're acting as if Stardock couldn't just conjure up some explanation like so;
"We've developed some impressive new weaponry that can be fired at faster-than-light speeds. Unfortunately, these weapons require massive amounts of power and space, which preclude them from being equipped on ordinary starships. Only starbases have the necessary energy and room to build these impressive weapons on, and even then they require starbases specifically designed for military use, since other types of starbases are not designed to provide the massive amounts of energy and raw materials it takes to make these weapons work. The good news is that you can fire on enemies from multiple parsecs away; the bad news is that these weapons are fairly expensive, can only fire once a week due to the incredible amount of energy needed to fire them, and that they're attached to an immobile starbase. Still, they can provide impressive defensive fire when the enemy gets too close to our borders."
Then you just expand the starbase tech tree to be broader; incorporate things like a "FTL (Faster than light) Weapons" tree. Obviously, you don't want starbases to get too many goodies in too few techs.
But seriously. This is why I farking hate arguing game balance based on ingame lore. It's absurd. The developers of this game DESIGNED the lore; what makes you think they can't spin it any way they want to incorporate whatever the hell they feel like?
The game mechanics require movement in order to attack. Movement gives initiative in space. Since starbases (excluding terrorstars) do not have movement they cannot have initiative.
I'm not terribly sure what this has to do with the "turret starbase" idea. If you're trying to say that such an idea could not work under game mechanics, I don't see why they could not be adjusted for starbases, so that it could fire at an enemy target without moving once a turn or something like that.
If a ship or fleet wanders close enough to a starbase for weapons fire, then it is not by accident. Therefore, ships decide when and where to do battle with starbases.
Yeah. So?