So you vent flux at 2x the normal flux dissipation rate. RFC reduces the time it takes by 25% which is an effective increase in flux dissipation of 33%. (While venting). So you go from 2x to 2.66x flux dissipation while venting.
It increases venting rate by 25%, and is additive with the skill.
That means you go from 250% venting rate to 300%, so instead of 10 secs you vent for ~8.33.
All comes from my own testing so could be wrong.
Flux resistant conduits are behind only Integrated Targeting Unit in terms of value. They are incredibly powerful for both player and AI. Faster venting = more flux for offense and less opportunity for strike weapons to impact before the vent is complete. This last point is even more important for AI: it runs a calculation on vent danger and is very cautious. By speeding up the vent, we can get the AI to vent in more situations.
50% emp damage reduction is just as valuable - flankers have less time to disable engines (and a single salamander won't do it anymore) and annoyances like thunders and claws are half as effective. Also ion beams disable half as much so you can safely lower shields or vent when being hit without catastrophic disabling.
Salamanders are also the bane of like... all existences.
This is where the different perception comes from.
I always end up giving everyone things with good mobility and decent shields, +hardened shields/front conversion where applicable. Salamanders/ion do not matter for those.
In big battles you want to get back behind allies once flux is high and higher capacity is really handy: gives a bigger buffer, you can't vent while staying on target(it'll backpedal and you get gangbanged).
Once you start biggish vents AI will also fire the missiles, easy to drop the ball and eat those with or without the reduced duration.
My perspective is a bit skewed as for the last few hours I just ran around with an Aurora/Apogee mix, with 10 officers+yourself those outstat and steamroll anything in the game(IR pulse/autopulse/phase lance spam).
Will get battlesize back to default and give lowtech/midline another go with mods, AI venting more could be an interesting improvement on hammer/plasma cannon sunder/whatever.
It’s cheaper to put RFC on a ship than equip rear facing point defense to deal with salamanders.
Rear facing point defense is very rarely not a good choice, later on almost every fight includes tons of fighters so it will find things to shoot at.