New words from recent years usually come a few dozen at a time (though that number has been growing), released at specific times of year. This means Okrand has more time to work out the details around each word/phrase, and more information to give. I also budget time around each {qep'a'}/{qepHom} to enter everything in to {boQwI'}. This is unlike the situation with the books, where he released thousands of words at once. I basically spent... months?... copying the word lists back then.
Even in those cases where Okrand spent some time discussing a word or phrase in a book (mostly in KGT or TKW), the information is often missing from {boQwI'}. Partly, this was due to lack of time to enter all the information, but partly it was so people still have to buy the books to get all the information (which protects Okrand's income). You'll see a number of entries where it says "For more information, see KGT p.xxx" and so on, because I assume that TKD/KGT/TKW will be available to most people. For the new words from the {qep'a'}/{qepHom}, I include all the information as I assume most people won't know where to access the original booklets, and perhaps they may not even be available online.
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De'vID