Who is going to pick that over their favorite drive pedal? I guess that’s a valid question but why doesn’t it apply to any amp? You either like the way an amp sounds better than you like a particular pedal or you don’t. And if you don’t, you keep using the pedal. I don’t know how the drive boost is designed but with it engaged the amp still feels like an amp to me. And I’m not sure I understand your second question. You can’t make the crunch channel high gain with its boost. The drive boost on the clean channel and the OD-style boost on the crunch/lead channels are completely different. The boost on channel 1 has a drive control that affects actual distortion. The boost on channels 2/3 has a level control but no drive/gain control; it’s like a TS-style boost with the gain control hardwired off.