The only answer I can think of for your question is that

Languages have many differences. If all verbs matched up perfectly, in meaning and usage, such as transitive/intransitive, reflexive/not reflexive, then we would lose the beautiful variability and richness of the world's languages. How boring that would be!

However, I thought you might like to know that there's another way of expressing the same concept, that is reflexive (pronominal):

darse inicio

Las clases se dan inicio el 27 de agosto.

The only answer I can think of for your question is that

Languages have many differences. If all verbs matched up perfectly, in meaning and usage, such as transitive/intransitive, reflexive/not reflexive, then we would lose the beautiful variability and richness of the world's languages. How boring that would be!

However, I thought you might like to know that there's another way of expressing the same concept, that is reflexive (pronominal):

iniciarse

Las clases se inician el 27 de agosto.