Trevor, it's not only the lower frequency interaction that's a challenge. M80s need room to form a more enjoyable soundstage.
The unfortunate reality is that buyers want top of the line which usually means they purchase floorstanders without due consideration for the space they'll be in.
They then space them close together and sit 6 or 8 feet away. The speakers sound "great" only because the buyers don't have the room to hear them further apart and from further away. They have no idea what they're missing.
I've been there, done that and will never go there again. I want to evangelize the benefit of larger rooms or small speakers for smaller rooms which lead to a better integration.
