It's important because every"body" is someBODY.
Whatever your understanding of "soul" is, you are not a spirit, you are a human being. And that requires that you are invested with a HUMAN BODY.
Life is the union of psyche and body.
You are a living being; to "be," you need life.
And to hold life, you need a body.
Christ promised everlasting life, not an existence in conscious death, which every other religion claims (even if only as a stop between reincarnations). That everlasting life requires an everlasting BODY to hold and express the life.
But no other religion has power over death; HE needed to demonstrate that HE had power to confer the everlasting life and Body.
And HE did it by assuming it Himself.
God Bless and ICXC NIKA!