Le board with only lack of rule "spam rule only rule not enforced"

What bases does a flooding rule serve may I ask?

Lets say I make a thread in this board, "hello jim, how are you?"

Jim replys "oh hi bob, im doing great"

And we continue a banter with no other people interjecting, are we "flooding" if so, Then I really dont know what to say.

fo·rum
ˈfôrəm/
noun
noun: forum; plural noun: forums; plural noun: fora

1.
a place, meeting, or medium where ideas and views on a particular issue can be exchanged.

What I had for lunch is a very important issue id like to discuss, be it with just bob, or 3 others.