Revelation of aayaat are not based on our understanding

Q: Volume 6, Book 61, Number 512: Narrated by Al-Bara: There was revealed: 'Not equal are those believers who sit (at home) and those who strive and fight in the Cause of Allah.' (4.95) The Prophet said, "Call Zaid for me and let him bring the board, the inkpot and the scapula bone (or the scapula bone and the ink pot)."' Then he said, "Write: 'Not equal are those Believers who sit..", and at that time 'Amr bin Um Maktum, the blind man was sitting behind the Prophet. He said, "O Allah's Apostle! What is your order for me (as regards the above Verse) as I am a blind man?" So, instead of the above Verse, the following Verse was revealed: 'Not equal are those believers who sit (at home) except those who are disabled (by injury or are blind or lame etc.) and those who strive and fight in the cause of Allah.' (4.95) is this how revelations change, based on a blind man's question?

Why did not the all knowing Allah consider the verse in a perfect manner in its first verse?

Do people who date get married faster?

Q: A lot of people say that when a girl decides not to date boys and rather to wait until a boy comes and proposes for her in the right way, then often she will end up waiting very very long until she is married. And that the women who don't wait and go out and find their own will be married off quicker. I have heard of cases like this and it is very demotivating. Is this some sort of proven or authentic fact? What basis do people have to say this?