When the Milanese loop magnet fell away, the watch was still dangling from my wrist. I’m sure other magnetic bands are holding up better, but I don’t think it’s acceptable to even have a 0.5% chance of your watch just falling away from your wrist, because the band detached, wrecking your 500$ watch. I also don’t think it’s going to be a "just don’t shake it too hard“-kind of solution; besides, they’ll want to have the same attachment mechanism across all watches to keep the bands compatible (for the same sizes).