There's a lot on that planet, but there'll be a lot in the other Prix systems too. We should definitely wait till the quick stuff is recovered and returned to Earth, but anything that could years or months to recover can carry on in the background while we move on to the next target, in my opinion. Most of what we're upgrading, like fighters and missiles are quick to replace and tend to get used up anyway - all those thousands of missiles we expended taking this planet were already obsolete, as it turned out.
Oh sure, churn out fighters and missiles, but there was talk of a strategic review and musing on a new, larger ship class to use now we have 20k ton military slips. Anything destroyer sized or larger is going to be a multi-year build. Also, just because Emu took out this Prix system doesn't mean we'll be able to take out others. The fleet was pretty lucky that the Prix seemed to be very low on shipkiller missiles.
Speaking of Fighters: Once we have faster fighters, will we make actual fighter strikes? That is, close the fighters to their missile range, fire, and return to rearm, rather than just holding them with the fleet to soak missiles?
Also, is SteveW Steve White, of Starfire fame? I was getting a lot of Starfire vibes from this AAR, but didn't think much of it until "SteveW" appeared.