I've read someone somewhere suggest that Buddhaghosa's insistence on listing and depicting all these cosmological objects (I know the section you're talking about - it perplexed me on initial inspection too!) is because he misinterpreted what "knower of worlds" means... taking it to be literal rather than referring to the "world" of the Buddha's teachings as defined by the Buddha in suttas such as SN 12.44, SN 35.82 and AN 4.45.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)