If you are unable to find the truth right where you are, where else do you expect to find it? - Dōgen

What is the significance of this? It was simply a demonstration of Parental Mind. The Tathagata did not do this in expectation of some reward or fame. He did it unconditionally, without thought of profit or gain.

To enter the Buddha Way is to stop discriminating between good and evil and to cast aside the mind that says this is good and that is bad.

All the Buddhas, whether in this world or in other quarters, in the western heaven (India) or the eastern earth (China), equally held the Buddha-seal and altogether enjoyed the supreme style. They were fully devoted to this total sitting (shikantaza) and were totally installed in this unmoved state. Even though there are a thousand differences and a million nuances, they engaged devotedly in practicing zazen and realizing the Way.