The United States, and the Americas in general have a long tradition of cooking outside. I lean toward BBQ stemming from the word barbacoa and it is surely most closely related to our traditional low and slow cooks.
"Having a Barbacue" has popularly included any sort of outdoor cooking, including actually serving a clam bake, for the better part of 50 years. Aussie's have long hated the term "throw another shrimp on the barbie" as well.
We've certainly experienced a renaissance of low and slow cooking over the last 15 years both in the kitchen and outside. I won't judge the process of anyone who's taken the time and energy to consistently turn out a good product. I also don't know that I feel people avoid reasonable innovation are doing any more important work than people who dress up as the pilgrims. Remember, even the stick burner was a revolutionary change at one point. Do what makes you happy and some people will find enjoyment in it!
My dad and I make lasagna. Every time either of us make it we are showered in compliments. But, the only opinion we actually care about is eachothers. We judge them harder than anyone is paying attention. We all share cooks on here for a similar reason - a lot of people we feed don't understand.
A movement like the one we are experiencing will have purists and revolutionaries.. With good product I think they both have room to be appreciated. For now, the fact remains, most people can invite friends over for a bbq ... serve them electric grilled hot dogs on a picnic table and all is well with their world.