I don't think there is any one cooker that truly excels at everything...
This is quite true. I think that each cooker has a particular skill set when preparing foods, and that if you want a truly complete experience, you'd be better off with multiple units IMHO.
For instance, we love to make pizza, and do so on three different cookers:
- wood fired oven
- standard Char Broil gas grill
- Big Green Egg - mini
We have produced good results on all of them, but the results all are different. In the wood fired oven, the pizza is slightly charred around the edges, and has that distinct wood fired taste that everyone who has ever tasted pizzas of that kind recognize. Definitely a favorite.
On the gas fired grill, we can get a super crisp grilled crust, which is completely different, yet just as delicious - just not the same. Also definitely a favorite.
The Big Green Egg - mini is a unit we mostly purchased for portability (we keep it in the RV). Big Green Egg sells a pizza stone for an outrageous price, but we purchased a pair of equivalent stones from Amazon for $12. It is lots of fun making pizza in the mini while in an RV park, and the flavor is good, but it is mostly just a plain pizza. Not really one of our favorites, but hey, taste is a matter of opinion anyway. We've not tried adding wood chips to the lump charcoal to see if a smoky flavor would change things.
I wouldn't consider doing a pizza on the Traeger.
The bottom line is that each of our cooking units will treat the same cooked item in a different (and thankfully typically delicious) way. Interestingly, I've managed to convince my better half that all of them are necessary, even though she shakes her head when I want something new.