Riiight...
Why isn't essence self-only?
Why isn't wrangle self-only?
Why isn't Iron Circle self-only?
What about Masteries, infuses, mochams, runbuffs, expertice buffs, HE, Mark of Peril (the new MA critbuffs), layered shields, warp time&space..., grid phreak (team), Superior First aid (doc +80 treatment), Brutal thug, headcracker, Feline Grace, Enhanced sences, Sniper's bliss, Riot control....damn, they're so many, I could go on and on...
Why do you think they're not self-only? Because they were intended to not be. They were intended as a part of the game.
Only problem is about those few NFs that became self-only, is FC had their head up their butt and never thought about concequences for certain nanos (MA critbuffs WAS overpowered, traders complitbuffs was Uber for low lvl chars, and they DID NOT want that... and so on)
Want me to carry on?