This is the main reason - because of political mind. For
renouncement, the objective is important, otherwise, it causes more
harm than good personally, to future of sangha and to all
wellness.
Eventually, Pajapati
decided that women should have the same opportunity that men had.
She went to the Buddha, who was in Kapilavatthu at the time, and
said to him "It would be great, Lord, if women were allowed to
renounce their homes and enter into the homeless state under the
dharma and the discipline of the Tathagata." She continued, "We
want to renounce too, we want to follow the path as well. Will you
allow it?"
And the Buddha's
reply was, "Don't set your heart on women being able to do
this."
She asked two more
times. And two more times the Buddha refused. Pajapati bowed
respectfully and left in tears. But that wasn't the end of
it.