Repeating Darood On Prophet (sws) 100 Times Or More
It is all about our affiliation with the prophet. We find ourselves praying again and again, for example, for our success or for our beloved relations for their forgiveness or recovery from an ailment, etc. So asking for the blessing of God for the prophet shows our affiliation with the prophet and with Deen too. That is why such things are not made compulsory or a part of shariah.