I'm sure dictoresno says D - O - S, because to say "dos" would be stupid.
I'm not suggesting that either approach is right or wrong, just that neither is "stupid".
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fine, ill rephrase.
some acronyms are meant to be spelled out, others are meant to be slurred into a word. calling BIS "bizz" just sounds dumb, as its very close to BES being "bezz". i just think, in this circumstance, pronouncing it sounds dumb. other acronyms do not sound so stupid and work when pronounced as a word.
further arguing about which way is correct is even more stupid.