I have multiple allergies so no dogs or cats...
But I do have a plethora of houseplants, they're awesome!
Oh, I am afraid our place would be your own personal nightmare

At least with regards to the allergies.
5 dogs, short haired, long-haired, from ages 3 1/2 to almost 16...and then there are 4 rabbits and 6 guinea pigs - yep, all of them in the house - but with very strict safety measures regarding the separation of dogs and rodents.

It IS awesome...and messy...but mostly awesome.

I guess plants are probably a bit less messy - but I do see your friend's point.

Plants are supposed to be super sensitive, or so I have been told (mine seem quite tough, actually) - so who knows if maybe they'd prefer a bit more privacy?

Sounds as if you're all getting along just fine, though.

And plants ARE awesome!