The more complex a species, the less adaptivity it has to fundamental shifts in environmental pressures. The interconnections between protein functions are directly responsible for that trade-off, and become a liability.
The time scales for evolution far beyond our current level of genetic complexity, probably extend beyond the life span of the Earth.
Now the benefit of this speghetti-code situation is that no intelligent designer is required - obviously a fundamental ingredient of abiogenesis, but does it benefit an species that's capable of genetic editing?
Nope. At this point, it's really just a bottleneck to even repairing the most straight-forward genetic diseases.
As a species, we're approaching the time where we've obviated evolution. ...I won't say we've seen that yet because reproduction rates are still very uneven across population segments, but it's only a matter of a few more generations (cataclysms not withstanding).