I've been a little curious for awhile now about the whole concept of ships being 'downgraded' in class. We see this in Spacedock with the Ambassador-class Explorer being downgraded to a Heavy Cruiser, based on the explanation that as Starfleet technology advanced, and its exploration needs changed, the Ambassador simply couldn't keep up with the times.
I'm curious, though, as to why a Heavy Cruiser rather than, say, an Exploratory Cruiser. It seems to me that a vessel that formerly was an Explorer, if downgraded to a Cruiser-type vessel at all, would clearly be at least as well adapted for scientific exploration as, say, a Constellation or Excelsior-class ship.
Anyone care to open a dialogue on this with me? I'm not looking to argue for its own sake, just to bat around the whys and wherefores until it makes sense to me. The philosophy behind these minutiae is oddly important to me, you see.
BJ