The great advantage of foil is that it makes it a little more predictable how long the meat will take to cook. With practice is also makes a more predictable product easier to achieve. It is a valid tool if you are cooking just a few chunks of meat.
I use Heavy Duty foil, as wide as I can get. I generally will put a pan under it to move it around, as the bone easily punctures the foil. I vent the foil a little, a couple of holes, but, that is not necessary.
"perhaps...but then again...maybe not..."
careful there son, those ribs are boiling hot...
(='.'=) Here there be bunnies...
Pacific Rim BBQ
Bob's Brew and Que