resources lost or destroyed. never knowing where a battle might break out. this probably went on for years. so yes the rebels overthrew the tyrannical empire but just created smaller more aggressive clusters of the empire in constant battle for resources. the most cost effective way to develop new war machines in such I situation, I would think, is take what you have and try to make it better with as little cost as can be managed. taking a standard tie and giving it a tail gunner is a huge leap into this direction. giving a fragile swarm ship protection from the rear in a dog fight would be worth its weight in republic credits to increase the survivability in a fight.
So: in the Star Wars universe, production is easy, but design takes time. It took 25 years to build the 1st Death Star, but only 2 or 3 to build the second.
The other issue is raw materials. After the Death Star was destroyed, the Empire had to deal with the Hutts to get new materials for the Second Death Star.
To me, that means it's unlikely that various Imperial fragments would be using extensively modified Tie chassises just because they had them laying around. You'd still have the problems of design, though the material problem would be alleviated.
More likely, I think, is that the Tie design is a fairly efficient morphology- it's small, compact, and basically has the best possible turning radius.
Also it's iconically Imperial, so if you're creating a 1st Order, you would not mind using something so reminiscent of the New Order.
I don't know about that, designing being a slow proceess. Some things may have required along time too design but we see other things designed and produced in a good amount of time, like Star Fighters. Heck they had like maybe 7 diffrent types of Super Star Destroyer during the Civil War and hundreds of them to boot.
I dont think they were dealing with the Hutts because they had a lack of resources. I thinhk they need some too move unoffically owned IMP material with non-Imp craft too areas the IMPs didnt want other faction to know they had activity in. We see the Empire has crap loads of planets they can get resources from and lots of factoriesa ll overt he galaxy that use these resources too build up the IMP War Machine. The onlh exception could be if they needed a rare resource thatt he Hutts had access to at the time. Like the Focusing crystals for the Mk 2 SUPER LASER, or Material used to make Dark Trooper / Purge Trooper armour but thats a diffrent IMP super weapon all together.
What boggles my mind is why half of you guys still think we're going to see these ships in the first edition of XWMG.
XWMG?
