I've owned many different breeds over the years. I always have more than one dog usually different breeds. Personally I don't make assumptions until I've owned that breed. Saying Akitas are aggressive is wrong.
Where do you get the information that Akitas are known for dog aggression from? Why are you assuming they are aggressive?
From personal experience. As a professional who works with dogs, I've got experience with many breeds - including Akitas, and unfortunately, I have never once met one who wasn't (at best) aloof with strangers and other dogs. Unfortunately, the last one I worked with was severely aggressive and I had to refer the client to a behaviourist as after several weeks, I still couldn't get within six feet of it without it aggressing.
I'm glad you've got a positive experience with the breed and I'm glad the ones you've owned have been friendly, but breed stereotypes and traits exist for a reason. Of course not every single Akita will be aggressive, just like not every Labrador will be greedy and not every single Chihuahua will yap. But there's a reason they're known for aggression and it's not because everyone is making it up or has no experience.
I also own a breed that gets very negative reviews on here - I know what it's like to want to defend your breed to the hilt, but I'm also not blind to their negative traits and I know full well that the negative stereotypes around my breed (beagles) exist for a good reason!
In my opinion, it's really important to be aware of the potential negatives of a breed before bringing one into your home - especially when that breed is known for dog aggression and you already have resident dogs.