ccs
41st lv DM
I think it was either stupidity (if intentionally done) or an oversight (if unintentionally done) not to at least give a guideline or default for this, with a notation that what's written is only a guideline and an individual DM may do otherwise should such make sense for her setting. Two or three lines of text, tops - I'm sure they could have made it fit.
I could be wrong, but I don't recall any specific instructions on how to generate NPC stats in other editions.
Of course I've been doing this so long that I might have just glossed over & forgotten them. Afterall, a few weeks into gaming it ceases to be a useful paragraph - unless you're trying to win an internet argument & want to quote it.
So if previous editions didn't need this instruction it might just be a case of the designers assuming new readers aren't stupid and can figure it out.
As for the rest of you, my fellow veteran gamers, though.... Why do you now need it spelled out?