I don't know enough about the boosters yet (and nobody does). We'll have a better idea in January after the winter cycle is winding down.
And nobody knows enough about the flu vaccine currently yearly formulation in every year of the last 50+, but it was still recommended and administered to 40+% of US adults. Covid-related antivaxxism is just latent antivaxxers finally coming clean.
Watch the TWiV videos, they go into detail, and I time stamped them