[ejstronge]

> if it did I would have thought it would have appeared in the past 5 billion years or so

It may have appeared and been outcompeted. That doesn’t suggest its (artificial) reintroduction would again be outcompeted

[XorNot]

It does actually, because it implies it fought and lost that battle the first time.

Now, with L-amino life everywhere it would have an even bigger starting problem.

We see this with extremophiles: organisms which can grow in nuclear cooling ponds full extremely badly when transplanted to nutrient rich environments with other, less capable organisms.