I noticed everyone is on about SI ( Superior Invisibility ). Why would you have this on in combat? Surely it's suppressed as soon as you attack or use a debuff.
@Unthing ... Mostly on Union.
Not if the attack is Decive 
Black Light, Electricity/Devices Blaster at Union
White Knight, Illusion/Radiation Controller at Union
Obscurum est absentis lux lucis. Ego sum lux lucis!
I think Stamina is largely a QoL issue. There are builds that are doable without stamina like claws / regen scrappers and bot / dark MMs, but ultimately life is a hell of a lot easier with it.
I have an Ill / Rad with stamina (currently lvl 43). I run (and LOVE) choking cloud with 2 end reds and 2 holds. I'll also leave CC runnning when in an AV fight, because I find that as it's a hold, it'll stack with my other holds (blind and flash) to help lock down the AV.
I only use Sup Inv when travelling through PI to avoid snipers, ghosting glowies or if I need to get close to drop PA in an AV mob; even WITH stamina and 2 lvl 45 end red IOs its a HUGE end hog.
These days with the travel speed buffs of swift, and the regen / recovery potential of Health the fitness pool isn't just all about stamina (for me at least), so if I were to drop it, realistically all I'd be getting is one additional power choice. I think I'd rather use that slot for something that's going to give me peace of mind in a long fight than an extra attack or other pool power that I could probably do without.
@SteelRat; @SteelRat2
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I noticed everyone is on about SI ( Superior Invisibility ). Why would you have this on in combat? Surely it's suppressed as soon as you attack or use a debuff.
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your target may see you when you attack, but his teammates wont, unless they are using +per.
it can be done yes. I have RI slotted with 3 hamis (def debuff/to hit debuff/endred). Tie this in with 3 end reds in EF, conserve power and AM and you have a viable build.
However, i would recomment still keeping it, as the pets really rip your stamina apart, especially with SI running.