Everyone has the same basic tools, a Muay Thai guy has the same tools as a Judo guy or an Aikido guy or a street thug.
You can draw distinctions in the way they use their tools but everyone has the same tools. Aikido should be thought of as another way to use these tools, just because there are no roundhouse kicks in your Aikido training does not mean that you are suddenly not allowed to use roundhouse kicks.
Aikido has no "magic" there is no secret Aikido technique which is inbeatable, infact, there arent even Aikido techniques which "just work" everything must be practiced.
Aikido takes a long time to get to "effective", Karate takes significantly shorter. Everyone, no matter your fitness / flexibility can both punch and kick. No-one can do Aikido naturally.
"street effective" means the ability to deliver enough damage/control to a desperate, enraged, adrenaline fueled, PCP dulled assailant to make him stop hurting you.
"dojo effective" means the ability to perform a technique with the right timing, distancing, posture, breath control and attitude, it has nothing to do with inflicting damage or attempting to subdue anyone.
Training in a dojo only makes you dojo effective. Training in the street gets you killed/crippled/brain damaged. This applies for all martial arts, even ones with so-called "reality training scenarios" rarely does reality schedule itself so that you can prepare for it.
Does this mean that Aikido and all other martial arts are useless for self defence?
Certainly not. Let us examine the Karate guy. Karate makes you "effective" in about 6 months to a year. Before Karate you can punch and kick and block. After Karate you can do all of those a lot better and most importantly, you got over the discomfort of making physical contact with a stranger and you feel much more confident. You are still just punching / kicking and blocking but you are no longer holding yourself back or feeling intimidated by conflict.
So, in conclusion (and apologies for being long winded) technique do not make you "effective", strength and speed do not make you "effective". Confidence, not being intimidated by conflict and practice makes you "effective".