> support system. We don't need a zillion difffirent
> kinds of plants, bugs
> and whatnot, we don't need 'natural' landscaping,
> and we sure as heck don't
> need multiple environments.
In an extended space voyage, you might come to appreciate a garden environment for recreation (as well as just a source of food/air/water receycling).
Of course you would have perks like the odd space walk and gazing out the window (or VR).