Okay, dude. You're arguing for arguments' sake. My posts have been regarding the OPs topic: NPCs that steal screen time from PCs. I'm not making "silly divisions."
When a DM is playing a character the way a player would, it's not an NPC, anymore, because it has as much agency as the players do. The DM is the NPC/DMPC. It's all the same problem. Why are you trying to create silly divisions between the DM and the characters they control?