People believing they are smarter than billions of years of evolution gives me no assurance that these people have a clue, let alone care about modifying people.
Putting evolution on a pedestal isn't much smarter. It's not some godlike entity which designed humans with a goal in mind, it's a very long, very sinuous process which often gives locally optimal but globally suboptimal results. There is no reason to think that humans, for some reason, can't do better.
Add functionality to the bands (would love control on the band (swipe or whatever) in addition screen since my finger isn't transparent).
Pebble are already working on this with their "smartbands" which act as quick-swap accessories for their new Time, though whether it'll catch on is another matter.
Any given program will expand to fill available memory.