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This is very true. But also ugly. I did have this previously on another bike, but sold the adaptor.
This would obviously be the sensible thing to do, but then if I was sensible I wouldn't have a di2 gravel bike...
Tempted by Hope RX4 calipers, but should probably just pinch another shimano caliper from my audax bike for moment and wait for one to come up on ebay. I just hate bleeding brakes so the less of it I have to do, the better.
post mount on flat mount frames is absolutely fine with an adapter