Believe me, I'm not gonna fix (or not fix) your floor, so consider me as another 'source'. What you decide I will respect.
I understand you're getting conflicting information. And I understand that you will 'just leave it alone and refinish'. But if you want to consider improving the floor, I'm OK with using filler to fill nail pops and 'nicks' and gouges on the FACE of the wood. (It's just those gaps that I won't fill.)
Well, 'nough said and thanks for listening. I certainly appreciate your patience w/me.
PS: don't worry about the dust. Just follow the proper cleaning methods for the finish that's on the floor.