My wife doens't play music through Itunes on PC, she just syncs. And she is not interested in Playcounts etc etc and in a year she did not add 1 song to the lib and II DOUBT sincerely that (during the time that I am away) she will sync even once, maybe only in case she has a new phone.
And when I come back from the Trip the MB will be the main Lib. I am not going to sync 2 ways / maintain 2 libs in the future.
Ps: That said yes, at the moment I play SONGS (read carefully where it says at the moment) via iTunes because my MB lib only has a fraction (90 songs) of the my iTunes Lib. but I only sporadically listen to MB because I am as already said MANY times just going from iTunes -> MB.
Edit Please DO NOTE: The first song I added to my iTunes Lib was in 2008, so that is 15 years of carefully maintaining it, and I don't want to F............ that up because of some error I make with MB, so that is why 2 LIBS (and PLEASE don't mention backups)
Sorry that my way of doing it, is not the proper way you think it is, but that is the way I feel comfortable with, and that is more important then what is considered preferred on here (and that is only because I am not that used to MB yet, just using it approx a week)