Why does Biden want to rejoin the WHO?

One of Biden’s proposed early actions is rejoining The WHO. As you recall, Trump exited the WHO on July 8, 2020. Coincidentally, that was a day before The Who finally admitted the possibility of airborne transmission. WHO’s admission was triggered by a letter from hundreds of scientists – see
https://thehill.com/policy/healthcare/505936-hundreds-of-scientists-write-letter-to-who-arguing-coronavirus-is-airborne

The WHO demonstrated complete separation from the truth between Dec 31 and July 8.

So my question is “Why does Biden want to spend our hard-earned dollars on joining WHO?”