One style guide I've seen (forget where) tells you to lowercase acronyms and capitalize initialisms. (But initial letter still uppercases when it's a proper nou

One style guide I've seen (forget where) tells you to lowercase acronyms and capitalize initialisms. (But initial letter still uppercases when it's a proper noun) So Covid, Nasa, and radar/laser; but FBI, CIA, and UPS. I do this in my own writing, except for “NASA”. Just feels wrong to lowercase that one. And of course, laser and radar are just words at this point. Their origins may be acronymic, but like you said: common language mints new words.