Forget about the chemistry of the stall. It happens, it takes forever at 225F.
Forget about the chemistry of collagen melting, which is what makes butts tender and juicy. It happens, and is the bridge to the next point.
Physics is involved as the temperature of the meat gets closer to the temperature of the chamber. The rate at which meat absorbs heat is based upon the difference in temperature between the meat and the chamber. Soooo, as the meat temp climbs, it absorbs less available heat as that range narrows for a low smoking temp, like 225F. THAT's why I bump the temp up.
You can smoke a butt at 300F, achieving a shorter stall and faster cook time, yet still get the same results. Or, you can start at 225F, reach the stall in 3-5 hours, then bump the temp up to shorten the stall and cook time, still getting the same result. You can start at 225F, sleep through the stall, then bump the temp up to finish like I do. Or, you can stay at 225F and take almost a full day to reach tender goodness. It all tastes the same. Try it. I have.
A wrapped butt is a steamed butt. Steam transmits a LOT of heat because liquids expand 1700 times when it flashes to steam, that's why wrapping speeds things up, but the steam softens the bark.
It's all a matter of what you want to do because a 10 lb pork butt knows physics and chemistry better than most of us, but ain't saying nuttin'!