As for ambushes it's absolutely not true that Rivendell wouldn't utilise that tactic; if they had the opportunity they would gladly take it, since a succesfull ambush decreases the chance of casualties. Lothlorien fights speedy and via ambushes only when they defend their borders. Do you think they can use the same tactic if they decide to go full offensive, and end up in a open 1v1 battlefield? I don't think so.
Edited by Bashkuga, 06 March 2017 - 12:27 PM.