As someone who works for a pharmaceutical CRO. This is typical language for the FDA. They are always worried about the adverse events. They want to know how the product negatively impacts the consumer because that is the area where safety becomes a concern. Let's be honest the FDA is meant to keep products safe, not effective. I think this is typical language for the FDA and should not be any indication of their personal feeling toward these
devices. Just think of them as a worrisome mother. They want to make sure it's safe.
They could care less about the benefits. They are there for safety not to evaluate it's effectiveness. With any drug or other product the FDA looks at they rarely look at anything but 1.) is it reasonably safe to the consumer 2.) Does it do what it's advertised to do.
Beyond that the FDA doesn't care. This is typical with everything the FDA evaluates.