is that not the whole point? you're gaining 15% range so you (might) lose some cqc ability
its the same principle hunting sight (and reflex sight, in the reverse) works on, why is it suddenly not ok?
i assume we're talking specifically about the ntec? in which case i would think the old downside of ir3 (increased maximum bloom) would be even less to your taste than increased bloom per shot
if not ntec specific i'd argue that raw ttk is more important than consistency in cqc, especially given that most guns that use ir3 start out far more accurate in marksmanship than dedicated cqc guns