My opinion:
1. Good husbandry would dictate that you preserve Philatelic material to the highest order.
eg Preserve Pairs, preserve multiples, selvedge etc.
To do this you can mount the original formats on your own designed pages.
Quote:
although I know it's my collection and I can do as I please
Given that, you then can decide on what you separate and downgrade,
it may be, your decision to separate low value common material
(separate minimal value definitive pairs etc)
You may wish to draw the line at blocks of 4, ANY marginal markings material,
any more valuable singletons, that you find in multiples.
If you have a singleton of any issue, then always mount, and preserve any multiples of its siblings.
Your commentary sounds very sensible, I am sure you will make prudent decisions.