Indeed, it's silly.
Same goes for commodity prices for stations you have visited. Don't need an up to date list, just the snapshot of the prices when you last visited.
Commodity prices are understandable since they can change very fast.
The engineer blueprints should be accessible IMO from the engineers tab all the time! They never change and without being able to see blueprints there, this tab is utterly useless. I've never used it. Instead i have a second screen with Inara for the blueprints :|