system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Which capital ship gun emplacement type is predominant, shielded gun port, casemate or turret?

Yes, I need a bigger nerd than me to have watched and read more of the Legends stuff.

And yes, I'm wondering why SW ship design is at 1920s level of advancement.
gpt
Casements are predominant for secondary battery, main battery turbolasers are usually mounted in  turrets, to reduce the overall number needed. Frigates will usually only carry casement mounted armament, due to the restricted space. The Republic and the CIS used destroyers with their main battery mounted in shielded gun ports, but it was less useful than originally planned on the Venators and the Empire converted those mountings to anti-fighter batteries.

Long range gunnery (which killed off casements in real life) isn't really possible with turbolaser technology, as the power dissipation at range is so severe. Battles between capital ships are usually fought at "knife-fight" ranges which prioritize rapid fire to overwhelm shields, and reserving the biggest guns for the coup de grace. Although, the Rebel Alliance relied more heavily on torpedoes than turbolasers when it came to finishing off disabled ships; torpedoes were simply cheaper.