Plus, you are really talking about outfits within capsules. You are interested in defining your outfits--what you put on in the morning--to make life easier, I imagine and to get the outfit right, after you planned it or tried it out. So your blazer is part of several outfits, and the outfits may have different "vibes" or perhaps worn to different places (work vs. party/not-work) hence capsule.
I try to use the ideas to both fill wardrobe gaps (nothing to wear to a party or wedding, hence need items for dressy/party/wedding capsule) or when I have too much stuff in one area (don't buy any more tops that are only used in casualwear capsule) or now also using if trying to move into a new style area or "look" which, if I can give it a moniker and have a mental image, may help me make the right purchases to achieve that goal.
It's all for fun and not to get to stressed about but I can see myself doing it, too.