My favourite Akita breeder, the one I am dying to buy from, uses kennels (they're gorgeous kennels too, not that that means anything, but seriously beautifully woodcrafted kennels on her garden). Given her breed, and how many males she has, I see no issues with it. Her dogs are rotated and are all very happy. She is grateful for them when heat times come around. I will leave each breeder up to my own discretion, but in general, kenneling doesn't deter me at all. It can be a necessary, safe thing for that breeder to do with their dogs. It can be abused and overused, just like any other tool. But I don't want to paint across the board and say every breeder using kennels doesn't know what they're doing and is lazy.