2 hours ago, Princezilla said:The EU was hugely inconsistent in this, and in many other things, one of the biggest reasons it had to go. For example, in Specter of the Past Pellaeon paints being forced to utilize non TIE craft just to stay relevant as a huge indicator of the Empire's decline. The Blastboat, like the Gunboat, was only in a small number of sources mostly by the same creators but within those sources their importance and widespreadness within the Empire was played up to huge degree that doesn't match their total absence from the movies and most other media. It was part of the EU's larger problem where the lack of any sort of meaning oversight allowed individual writers to try and completely alter the state of universe to play up their own pet creations or theories and it resulted in numerous wildly contradictory takes on the overall universe that often even ran counter to what was in the movies.
Well the GUNBOAT, DX-9 Transport and many other 'off screen' craft existed in the sim games for reasons of needed shielded craft, having a heavily armed transport vehicle, or graphical limitations.
The OT took place in very remote sections of the galaxy and thus had little presence of Imperial armed forces until Rebel activity was spotted. Then entire fleets of ISDs were deployed to those spots. This implied that ISDs are the primary ship to project overwhelming power in the name of sabatoge or dire security breaches when there is a minimal Imperial presence. ISDs are basically mobile garrisons, battle stations and patrol craft all in one.
In the more populous systems there may indeed be more numerous but smaller craft that more effectively police the massive traffic and interactions within the Empire. IPVs, Decimator, Skiprays, Escort shuttles, Gunboats, Assault transports, ect. could be used for customs duties and patrol fat from rebellious war zones, but nevertheless may see action if and when the Rebels decide a certain transport convoy needed to be 'liberated'.