From a manager's point of view: This person just wants to know what you're up to. It's not a judgement, it's a simple query. It can be solved via additional communication. Probably best to do on the phone so there's no confusion but email works also.
> how can a company expect to retain employees/contractors if the only work available is the same tedium over a long period of time, and no way to change that?
Actually, once you've established that you're capable you can usually ask for assignments / work that interests you more. This also requires additional communication. Even if there's nothing immediately available, your manager will keep it in mind when looking forward to the kinds of work you express interest in.
> how can a company expect to retain employees/contractors if the only work available is the same tedium over a long period of time, and no way to change that?
Actually, once you've established that you're capable you can usually ask for assignments / work that interests you more. This also requires additional communication. Even if there's nothing immediately available, your manager will keep it in mind when looking forward to the kinds of work you express interest in.