I do not know where you live exactly, but I checked today's weather in Calgary. Today the temperature is supposed to range from a high of 82 F to a low of 56 F. If you are doing a really long cook, that is a difference of 26 degrees ambient that the Traeger controller has to adjust for. If the sun is shining directly on the grill during the day, the difference in effective temperature might be even greater. I have measured temperatures inside my grill as high as 150 F without ever igniting the fire.
In Alberta the temperature in winter can plummet as low as -40 F for short periods of time. That is why we call it an Alberta clipper here in the Midwest USA when frigid winds from Alberta come pouring southward through the Great Plains into the Midwest causing temperatures to plummet below 0 F. Do you really expect any uninsulated grill to be able to hold temperature under those conditions?
I have an Ironwood 885. Since it has exhaust vents in the back rather than smokestacks. Traeger does not even make a fitted cover for the grill. I plan to wrap my grill in a couple of welder's blankets during the winter so I can smoke a turkey at Thanksgiving and a ham at Christmas. It won't be as convenient or as attractive as a fitted cover, but I hope it will get the job done.
With an offset smoker or charcoal grill, it will be very difficult to keep the cooking temperature within +/- 15 degrees F. The variations in the fire that occur due to the temperature swings allow development of the flavor compounds that make BBQ so tasty.
No Traeger grill is going to match the smoke flavor of a wood fired offset smoker. That is why people who want more intense smoke flavor use smoke tubes filled with wood chips or even wood fired smoke generators.
An aficionado is a person who is very knowledgeable and enthusiastic about an activity, subject, or pastime. So yes, there are aficionados on the forum, but because they are "very knowledgeable" they are not blind to the shortcomings of the grills; they have just learned how to overcome most of them. Many of us also have alternative methods of cooking when the Traeger is not ideal for that purpose. While Traeger can do many types of cooking, that does not mean that it does everything well.