I know BOB is an after market add on, but it's such an integral part of the game for almost every player it would make sense to do this
Really? Do you have any evidence for that?
It seems to me that every time it's mentioned, someone asks what it is, so I'd think it's far from universal, but I don't have any statistics.
It may be normal for the serious players but I'd be interested to see how many actually do use it, especially amongst freemiums. I don't, for one...
Depends what statistic you want. (And no, I don't have any, but I've read discussions of this nature before.) Taken as a percentage of all users, only a small minority use it. However, if you consider some smaller subgroup it becomes more and more common. Among the hard-core players who are the backbone of the Tournament world and the Clan world, I'm estimating it as better than 80%.
But to me, the important thing is not BOB itself, but the features that come with it, which seem to me as no-brainer things that would be included in the basic game. For instance, the fact that when you mouse over a tert, the places you can attack from there are highlighted. It just seems like an obvious feature that should come with the game itself. Why should you need an add-on to do something so seemingly obvious? It's because the existence of scripts like BOB saved the developer the need to improve the basic game engine. Why spend your own resources to add a feature when unpaid volunteers will add it for you? It's high time these things were incorporated into the game itself.