Kaffis Mark V wrote:
But if you're employing it as a strategy, you don't need to build the whole ship. You slap a hyperdrive engine (and enough maneuvering engines to aim it) on a hunk of asteroid or whatever's handy.
We've never seen them "slap a hyperdrive" on something other than a ship either. We don't even know if that would be feasible since we don't know how a hyperdrive interacts with the rest of a starship in order to work as a package. We only know that they DID do it with a complete ship, and a big one at that, and they did it in extreme circumstances. We can't generalize from "works in an extreme edge case under highly particular circumstances" to "therefore must always work, but hasn't been done before so plot hole."
In particular, we saw in ESB that Star Destroyers could easily vaporize asteroids in a single shot, so there's little reason to think they'd be vulnerable to this attack.
There could be other problems as well. We have no understanding of the transition of an object between the universe and hyperspace, so we have no idea how reliable this is. It might be that it only works within a precise distance from the target. There's a host of other information we would need to know in order to even begin to decide if this was viable on a normal basis.
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Likewise, when you're improvising and doing it out of desperation with a real warship, you let C-3PO (or a droid less sentimentally valuable to leadership) hit the button. You had given up on the warship's survival anyways, so that shouldn't come into the discussion.
But they didn't do that. They had a vice admiral do that. At that point, a ship designed for hundreds or thousands of crew was being managed by just one person. This is an obvious edge case and that doesn't translate to "obviously should be do-able all the time."
Prior to that, the New Order had the overwhelming advantage. It's entirely possible, even likely that they simply weren't taking precautions as they should have been which normally preclude the use of this tactic. In fact, it was obvious they were surprised by the move, so it's safe to assume it's not normally done and was a desperation gambit. Their commanders certainly don't appear to be lacking in arrogance as a character flaw which might easily lead to laxity when in a position of advantage.