I had to stop reading after the post that I inferred that if my parents did their job, they would be parents not friends.
My mom was my MOH. She was an excellent mother and was not my friend growing up. She always says now about my teen years, "I always loved you, but I wasn't sure if I would ever like you." I wasn't an awful teen, but I certainly wasn't pleasant. I had three other attendants- the only one I still talk to is my SIL.
After my teens, my mom and I grew closer. At 23, I married my high school sweetheart. Now, nearly 15 years later, I call my husband to share news first and call my mom second. It was that way then too. Why wouldn't I have her stand beside me on one of the biggest days of my life?
BTW Speaking of biggest days- She was in the operating room when my twins were born too. (My husband was there also. Since I am sharing, my dad almost was - that would have been really weird- so I am glad that the nurse forgot to get him.

)