That's why they added caps on casting time to some nanos I guess. Wish more nanos were capped though and interrupt modifier reduced a bit. Mostly NCU Coolant Sink which has been badly corrected. It should give 1-60% which seems to be the intended buff (was 99-40% before the 'fix'). Now it's 40-99% which just make anyone immune to interrupts. Not like many wear one tho as instacasting their nanos already make them immune.
For weapon speed, main reason is that noone use a crit scope anymore to PvP or it would be harder to cap speed. There's also that odd decision from previous devs to make new weapons faster than old ones. It makes more sense to boost their dmg while making them slower imho. Just check AI weapons and their LE counterparts.
Also, while I'm on it, MA weapon template (
1-
3000) got it right, Salabim Shotgun (
1-
300) not.