I don't agree, there are only a few B-sides that would fit on the album of that Era.
IMO only Bounce but especcialy Keep the Faith could've been better with b-sides on it. For example faith, replace woman in love, I want you & Blame it on the love ... with Radio saved my life, Fields of fire & why aren't you dead or sympathy and it would've been even a better album as now (IMO)

But in general NO, for example the boxset. If I relate to the era of a song and think of the album that was released, there would only be 6 or 7 songs I would like to been replaced by a boxset.
I already named 3 (well fields of fire not on boxset but whatever)

I do think that they pick the wrong singles to be released - but only since 2000 and everything went down since then....