@evouga Well let's look at the possible cases. Either a) the hatebear companions suck compared to the actual do stuff companions, b) the hatebear companions end up far more powerful than the do stuff companions or c) the hatebears end up perfectly balanced with the do stuff companions.
In case a) and b) clearly the problem is not solved. Case c) seems to be what you're focusing on but I'm afraid wizards' record of printing cards to deal with problem cards is very poor. They either push way too hard or not hard enough, so I think case c) is incredibly unlikely. Combine that with the fact that vintage would just be lurrus dominated until wizards got around to printing more companions, I think the idea is kind of fun to theory craft about, but practically speaking a total nightmare for vintage.