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The trackpad foam seems higher quality and easier to peel off the trackpad, while still allowing disconnection of the cables without removing the foam itself.
The trackpad is replaced as a single unit, so you don't need to remove the foam to do a replacement—unless your replacement part doesn't come with the foam. Then, it must be peeled off. Some damage is likely but not dire.
The fact that the frame is soldered to the trackpad probably doesn't increase the cost too much, which is good.