I know that some people advise starting out at a lower temperature on a pellet grill, because smoke output on pellet grills usually is greater at lower temperatures. As far as I know, that is a valid reason for starting out lower than you might on a stick burner... it's probably the only valid reason for starting out at a lower temperature on a pellet grill. I used to recommend this technique frequently and to some degree still do recommend it for someone who might want to get a bit more 'smoke' flavor on their food.
For most 'bbq' , starting out low and then increasing to finish doesn't present many challenges, other then trying to time out the finish of the cook... But I've totally given up on the technique for cooking chicken that has skin on it, it's just too hard to get the skin back to being edible if you start out at low temperature... Chicken skin turns to rubber at low temperatures and try as I might, I've never really been able to get it to ever recover by increasing the temperature at the end.
If getting extra smoke flavor isn't a issue for you, there's absolutely no reason to start out low temperature... On the two pellet grills I use the most ( Davy Crockett and PG500 ), I have no problems getting the amount of smoke I want , so I typically do BBQ at 225 to 275F and run at that temperature from start to finish. With Chicken that has skin, I'll run 325 to 375F start to finish... If i were to do skinless chicken, I'd do it between 225 and 275F start to finish...
Other than possible temperature difference, I don't employ any special techniques for pellet grilling.