Scripture explains that the sower in the parable is God but that only tells us who owned the seed and disseminates it.
Realistically, no sower will ever walk up on completely good soil without having to break the ground and 'create' it. Roadside is not conducive to growing crop because it's too often trodden upon, so the sower would have to post a "stay off the grass" sign, or the vultures will only consider it a buffet table. And the rocks will hold water so seeds might sprout but they hold the seat up away from the reaching any nutrients in the soil and have nothing they can actually grab onto. And in the case of those growing among the thorns which we are told are cares of the world, that is useful in providing reader some horticultural insight to 'do not worry,' which would help in understanding exactly what would need to be pulled in order to clear that particular patch so that it is more conducive to growing crops.
In another post, I speculated that the man that pleaded, "Lord, I believe. Help my unbelief," might have recognized the rocks in his heart and so was asking for help to remove the rocks out of the soil of his heart. I'd imagined that he had been 'often trodden down' by his child's condition.
IOW, he received the word and asked for strength in doing the work of removing the rocks so that the seed could flourish.