How to put this... It's really difficult to put in words.
Imagine doing business with a friend. There are times when you are just friends but there are also times when the relationship is mostly business. The key is finding the balance that works best for you. When show season comes around its mostly business. There are goals in mind and the main purpose of our relationship is to achieve those goals. However, it can't always be like this and it really doesn't have to.
Also consider sports teams. When team mates hang out it's all fun and laughs but when it's game time everyone better know their job well or things could come to a head and the game will be lost.
The only difference here is that riders have a double role. We are both team mates and coaches. We have all the leadership responsibilities of a coach in addition to all the companionship and partnership responsibilities.
It's certainly a complex thing and requires a lot of balancing.