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hippy-
I think the crash bit is the main selling point.
FYI I got a full Ultegra Hydro groupset from Vanilla bikes (with the bluetooth thing and braze on adaptor extra) for £1350 which I thought was pretty good. 5% extra off Shimano when I ordered
They also swapped the 3 port junction for a 5 port and ordered in a 46/36 chain set for me FOC.
cjr
You don't need a special dropout, the derailleur should come with an adaptor for normal dropouts. Direct mount derailleurs use the shadow + shape which brings the derailleur slightly under the chainstay and therefore a bit more protected.