I follow what American scientists and experts overwhelmingly recommended getting booster -- proven to be the most effective tool in avoiding hospitalization and death for as many folks as possible.
To the extent that reasonable scientific minds across the nation and planet seek to vet the advantages/disadvantages/scope of the booster, then let that conversation and debate flourish.
Have you considered that the WHO's primary focus is getting the planet vaccinated ... a much greater priority than booster shots for First World kids.