The Didymoi's terrifying proximity mine sound is a good cue to dodge missiles that'll phase past shields. However, the visual cues are a bit subtle when there's mixed fighters and missiles in the air.
Probably not an issue with Mayasura's fat, noticeable fighters. Definitely an issue when you sell DME drone blueprints to pirates along with the Didymoi, and a Legion spawns with 4 wings of 'em. It took a few reloads and flying around with god mode to figure out what the hell was making that noise.