>

Those are reasons, but I'm not sure if they are enough to tip the scales in favor of real plants over fake. It certainly makes live plants feel more appealing - but only for a few small use cases.
Edit: also, I lived somewhere with no yard, but had a balcony where I had plants. That can work for many people.
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It depends what you want plants for. 
To make a place look cheery and natural-ish? Sure, fake plants are fine. 
But if you want a pet substitute that needs fussing over and special care, a real plant is the way to go. 
And of course there's the oxygen-making aspect, although one plant has minimal effect. >

This is it exactly. There's also the question of growing food for some plants or pleasant smells for many flowering plants or even plants for...erm, medicinal or recreational use. >

You can better grow food outdoors than indoors. If you had 0 access to outdoor space this might be a benefit.
Smells are nice, but opening a window with plants outside would do the same AND allows you control over the smell in your house. >


You can better grow food outdoors than indoors

Not everyone has a yard.

If you had 0 access to outdoor space this might be a benefit.

So you recognize this is a valid reason

Smells are nice, but opening a window with plants outside would do the same AND allows you control over the smell in your house.

Again, not everyone has a yard. And you're assuming the everyone lives in a location were this is a valid choice. They might live somewhere overly hot or cold, maybe they in a high-crime area or maybe they work nights and sleep during the day. Maybe they live near a source of noise or somethin I have a friend who specifically grows food inside because not only does she live on the edge of the hood but she works nights and can only regularly garden during the day.