And why shouldn't they? The TIE Defender comes from an economy that can construct and support multiple moon-sized battle stations . If they chucked the budget of a star destroyer into a single one-man fighter, they're going to have the best starfighter fighter in the galaxy.
I don't see why this isn't easier to understand. If anyone in the mythos is going to make the best fighter in the galaxy why wouldn't it be the empire? Just because they aren't the heroes, whom have the characteristic of running a plucky shoe-string outdated space navy?
It isn't cheesy, it's superior. Because the Empire can afford these ultimately superior fighters. Sorry you rebel types can't compare with what comes out of your charity funding
The TIE Defender in AoR is meant as an end-level antagonist and as a soft barrier of "you don't want to be here." If the player party decides to go incredibly off the rails and loot the Emperor's personal safe in a serious campaign, throwing a flight group of TIE Defenders at them is one way to convince them they shouldn't do that.
Edited by Norsehound