Chemistry aside, meat absorbs heat based on the temperature difference between the meat and the surrounding environment. The smaller that temp difference, the slower the meat temp will rise, and visa versa.
A 191F roast in a 220F chamber can take hours to reach, say 205F. If you bump the chamber temp to 275F, increasing the temperature differential, that meat will get to 205F in an hour and will taste exactly the same. It's all physics.
There is nothing magical about 225F except time in the smoke. But once you hit the stall, bump the temp to speed things up.
I've roasted and smoked pork shoulders at temps from 225F to 350F. The difference in taste and texture is negligible, except the lower temps give better smoke flavor.