Catan and wednesday's game rule

I have been sick for the entire weekend, its really unusually to catch cold in summer.The Catan game last Wednesday was really fun. i kept thinking about why Catan-kind game becomes the main stream of the board game market? My opinion is that these games really did an awesome job to make players interact with each other instead of just using strategy to beat others. I remember there was an old game called D&D(I think everybody whats this is ), that game was so complicated that you need 25 dices and a calculator to actually play it,but still there were massive people play this game. One player plays Dungeon master, and other players need to pass through it. when people play it , there were no fixed rules from the game itself but from the dungeon master, and this gives the players the chance to talk, to interact, to negotiate with others. And I think this is a great element and we can use this in our game,

P.S you should go check out D&D, that game really improve your communication and calculation~