The thing is, if you assembled a human from all these 2.0 organs, it'd be less then the sum of it's parts, as most of the things one organ does wouldn't be needed anymore due to everything else being upgraded.
Why? stuff will change but you still need the same basic functions every organ does to have a self-replicating autonomous biochemical machine.
Brain--> problem-solving to achieve primary goals
digestive system --> acquisition of power and building materials
immune system --> defence from inside and outside microscopic threats
and so on and so forth.
So let's say I write a new Digestive System:
The iGut is capable of dealing with all standard human foods, possess a limited ability to digest cellulose for emergencies, can be programmed for specific calorie controlled diets, will attempt to intercept all known allenergenic molecules before absorption and is capable of purging to eliminate parasites or infection.
I also write a new Immune System:
White Shield is a complete immune response control system. It can be used as a suplmentary sytem to your own old immune system, or better yet as a complete replacement. White Sheild allows you to control your body's response to things, drastically reducing the chance of immune-rejection of your latest upgrade. White Sheild Nanites are non-blood dependent, so they can travel anywhere. Need to sterilise a cut quickly? Just concentrate and then spit on it. Not looking to have children yet? Allow White Sheild to selectively disable the sperm as they pass along the duct. White Sheild can even pass into the heavily acidic zones of your digestive system to eliminate even the strongest of bacteria.
Now - these two are individually are better then the sum of them, becuase they overlap in certain areas. How many layers of protection does my gut need?
That's assuming they're even compatible. Software conflicts are bad enough, i'd not want that conflict happening in my small intestine.
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