doctorbadwolf
Heretic of The Seventh Circle
It’s possible that you’re skipping past the downsides, and underestimating the benefits of controlled biomes. If a pathogen kills everything in your biome-farm on Mars, it’s one of hundreds and it’s focused on a type of product.I think you underestimate the utility of an entire alien ecosystem. It's far larger, more varied and more complex than anything you're easily going to be able to build artificially. It's not that it allows you to do anything major that you couldn't already do, it's that it allows you to operate on far greater scales than you could anywhere else, beyond your own native ecosystem - and you probably prefer not to mess with that one too much.
If it happens in a naturally evolved planet-wide biome, you’ve lost exponentially more.
It’s also easier to avoid in a controlled environment, and you can grow biologically incompatible things in one facility when the facility is a series of biome bubbles in orbit or on a moon or small planet.
Hell, even a planet, a FTL civ can’t yeet ice moons at rocky planets and seed a fast growing atmosphere-building algae to help turn that water into atmosphere? Like, we can’t, but we aren’t an FTL civilization.