If this is a game about tradeoffs then the ironsights too should have a tradeoff - and that tradeoff is "aim" time. That's how BF3 did it. Irons were the fastest, then holos, then red dot, then the 3.4x, then the ACOG, then the longer rifle scopes.
If PS takes a similar approach where irons are the fastest aim time (and in return you don't get any zoom and have to 'deal' with the graphic of the irons), then it absolutely matters.
Cycler irons are god awful; Gauss irons are great. From what I saw of the Pulsar that one looked good too. The Cycler stood out as being downright unusable and a mandatory optic upgrade, thereby foregoing any irons benefit that might exist (or be added).
__________________
|