Nah, the Feddies just use their sci spam BS and subsystem targeting to disable and hold ships while bludgeoning them to death. They don't need energy draining.
I love it when Feddies complain about KDF drain abilities, but don't seem to see a problem with pre-made sci spamming teams that also toss in a few pay-to-win abilities (graviton pulse being one). I don't do either, tbh. The only P2W I use is Impulse Capacitance Cell (which can be overcome with sci spam or subnukes). Other than that, I just rely on decloak alphastrikes, skill, and a bit of luck.
Did you just crawl out of Season 2-3 hole or something ? What is a sci spam in current state of DPS Online ?