Why ordain the way we do? Why not take on it upon ourselves, like the Buddha, to renounce mundane life to live the holy life?
"Before my Awakening, when I was still an unawakened Bodhisatta, the thought occurred to me: 'The household life is crowded, a dusty road. Life gone forth is the open air. It isn't easy, living in a home, to lead the holy life that is totally perfect, totally pure, a polished shell. What if I, having shaved off my hair & beard and putting on the ochre robe, were to go forth from the home life into homelessness?'
"So at a later time, when I was still young, black-haired, endowed with the blessings of youth in the first stage of life, having shaved off my hair & beard — though my parents wished otherwise and were grieving with tears on their faces — I put on the ochre robe and went forth from the home life into homelessness."
— MN 36