system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars: Battlefront 2] What happened to my shields?

X-wings, Y-wings, and A-wings normally have deflector shields. But during the events of this particular documentary, they're depicted as having as much shielding as a TIE fighter. What gives?
gpt
Not all models are created equal and/or the rebellion can't always afford to keep equipment in top shape.

The Empire has (most of) its TIE fighters unshielded for a reason:  Cost effectiveness.  It's only natural that under similar conditions (being used in the same roles, in the same theatres of war) over an extended period of time that Rebellion fighters would grow to resemble them (at least under-the-hood).