This time we hope to acquire a great agent, but will settle for a good agent who's comfortable with our wide spectrum of projects. Don't count on it. Agents have specialities, just like writers do. Just don't expect that agent to be as familiar with fantasy editors. That's not her field of expertise.
Agents narrow their focus out of necessity.
The publishing world is immense, volatile, constantly changing and difficult for even the best agents to track. A writer not only needs to find a trustworthy and compatible agent, but one tuned to the author's field. You need an agent willing and able to handle your projects or you'll still end up doing your own marketing. This happens when an author is selling, but the business side of writing washes out the creative side. You must weigh priorities.