It seems `\Bbb` is obsolete compared to `\mathbb` (see [this question on Tex.SE](https://tex.stackexchange.com/questions/51530/obsolete-comand-bbb)), but I've had no problems with `\Bbb`, and `\Bbb` is shorter than `\mathbb`. What are the possible dangers of using `\Bbb`, and should we all use `\mathbb`?