I agree. But as you can see there are two groups who believe that such a choice MUST be made for every single verse. To that I disagree because logic provides that A&B can be true, that A&B can be false and that either A&B can be true. Further, just because I do not currently see a literal truth in a metaphor or a metaphor in a literal truth doesn't mean I have considered all possibilites. I often come back to verse that reveals itself in new ways.
I had this experience in several verses. One in a verse that seems to contracdict PI, which literally proves out that it doesn't and another in the mustard seed that literally seems to say its the smallest seed which literally it doesn't. When one takes a closer "more literal" reading of those its becomes obvious (at least to me) that they are literally true.
The mustard seed story is a good one for the literalist that shows how Jesus taught from the literally true to the metaphorically true. Both levels work at the same time.