It all depends on the weather.
How many days is it comfortable to have breakfast out side on the patio. Canada is cooler than California and this summer we have had alot of stormy weather when nobody is out on the patio. When you carry a chimney you have the option of being inside out of the wind, rain and smoke. I do not need a different rig for the coldest winter weather.

Without a chimney a camp shelter is only a fair weather outfit. You can tell that by how many tenters there are after labor day or before June here in Canada, their equipment is designed only for fair weather. We have days in summer when the temperature does not get above 10 C. Its no fun cooking and eating in a cold wind around a little gas stove and in the rain its impossible.
How much is a "lot of weight"?