Mention the word foil in BBQ circles and it's worse than farting in church; everybody looks at you and gasps (not that I know first hand or anything).
But here's my viewpoint. Foil is a tool:
For beginners, it goes a long way to enlarge the "done" window, and provides a wider margin of error.
For the experts, it's still a tool used to tenderize, shorten cook times, hold food, prevent aliens from reading their minds and stealing their secrets (when worn as a hat), etc.
So when you mention foil and get that "What? You wear white after labor day??" reaction, realize it for what it is and use the tools available to make your meat the best that you can. As you get better, your use of different toos may change.
Disclaimer: the author does not condone farting in church or other public places.