Anyone familiar with Legends - especially games - will know how consistently weak these crafts are. Take the Rogue Squadron series of games for example: TIE Fighters are easily one-shotted while Interceptors can take slightly more damage, while A-Wings are also very vulnerable to damage. This is because of the Empire's quantity-over-quality philosophy, and the lack of shields on rank-and-file TIEs. As for the A-Wing, it was designed to focus heavily on speed and agility at the expense of shield strength.
How have things changed bringing these crafts into Disney canon?