The first form is referred to as a "little idea", but you don't really understand what that means exactly at the beginning. But the more one deals with Wing Chun, the more one becomes aware of the importance of this form.

It not only teaches the movements themselves, but also how to generate immense energy with little effort and transfer it to the opponent.
This does not happen with great acrobatic or physical effort, but through the relaxation of the joints and the preservation of one's own balance. This gives you the upper hand and you can defeat significantly stronger and larger opponents.

The further you progress aka the more you embrace this bio-mechanic, the easier it is to move and engage with your partner or opponent.