After dipping my nose into some Biology coursebooks I came across a fact that got me thinking.
Our bodies are filled with bacteria and (more importantly for this SCP) retroviruses. Retroviruses, if you didn't know, are simple organisms that can only reproduce inside a host cell - they do so by getting inside the host, then after some jiggerypokery which takes much explanation, they incorporate their DNA into the host's genome (hereditary information), the host then goes on to produce more of the retrovirus as part of it's normal function.
While there are a few dangerous RVs (HIV to name one), there are tens of thousands that live unnoticed in our DNA (around 40% of our DNA is comprised of these genetic vagrants).
TL:DR, there are lots of viruses that live in your DNA that your body doesn't notice, and they can cause nasty shit.
Since there's all this trash lying around in our DNA, it wouldn't be too much of a stretch of the imagination that this leaves our bodies weaker, and stops them achieving our biological potential? I have the idea of there being a derelict facility that was devoted to growing genetically perfect humans with none of these viruses. The downside being that humans created from the machine will be pure human - they won't have any of the beneficial bacteria in their bodies and as a result suffer many setbacks including poor digestion ability, a terrible immune system and a slow growth rate
The benefits would include a very long lifespan and exceptional mental and physical development.
I hope this was not all poop, as always, thoughts and criticism are very much appreciated.