Here [in the story about Wonderful Voice Bodhisattva’s visit] again is expressed the idea that the sahā world, despite its obvious shortcomings, is something special, and that this is related to the presence in it of Śākyamuni Buddha. There may be other reasons for this, but I suppose that the great size and magnificence and accomplishments of the Bodhisattva Wonderful Voice contribute to the enhancement of the sahā world and Śākyamuni, since he comes to the sahā world to pay tribute to Śākyamuni Buddha.

In fact, there seems to be an implication here, and in other instances where bodhisattvas come from outside the sahā world to visit Śākyamuni Buddha, that the sahā world is especially important because it is a more appropriate, that is, more difficult, place for bodhisattva practice. One of the repeated themes of the sutra is that one can and should learn from difficulties. Salvation, in this world, is not a matter of freedom from suffering and distress, but rather an ongoing process of overcoming evil by helping others. In this sutra, for example, Śākyamuni Buddha simply thanks Devadatta, well known elsewhere as the personification of evil, for being his teacher, and predicts that Devadatta too will become a buddha. In this sense, this world offers many opportunities for one to enter the Buddha-way through bodhisattva practice.
A Buddhist Kaleidoscope; Gene Reeves, The Lotus Sutra as Radically World-affirming, Page 188-189