I understood the same. On contrary I believe that an admin has its own responsibility and none should overtake it from him or against him.
But it wasn't overtaken! The password is on the sticker. Use it, and change the unit as you want. The problem is: YOU are an administrator, and know what You are doing. The user isn't - and this is aimed at users.
We already are battling hordes of compromised zombies, from CCTV to IP cameras, due exactly to default password. If anything, Mikrotik should be applauded in killing this would be botnet on the cradle.
Yes, I know. You may loose the sticker. True. Why not netinstall it first, using the password you like? This isn't an ISP product: this is a consumer product.
I believe the ISP line will get around soon.