I guess this gets into what the meaning of ‘conservative’ is and whether we have different definitions? For me, here it means something like, “in the face of uncertainty, assume the very least amount.” Given I can make sense of the term as figurative language and can also make sense of them as literal I think the figurative has the smaller amount of baggage. Why? Because it doesn’t involve me assuming “is”, “are”, “be” as positive truth values in the face of the unknown.
To be sure, I don’t know that the figurative is the case. I don’t know if the literal is the case. I don’t know if it is some combination where sometimes it is meant literally and sometimes figuratively. I don’t know if there is some third, fourth, fifth possibility that I’m overlooking or haven’t foreseen. I know very little.
In my own experience, when I assume the literal and commit to some hypothesis like “although I don’t know it to be the case, unless shown otherwise I’ll assume the passage is literal” I find that over time this uncertain statement has the habit of slowly turning into a certainty or near certainty in my mind. I find myself arguing that the literal is actually the case when in fact I don’t know it, I’m just assuming it.
In my own experience, when I assume the figurative and don’t commit to some hypothesis that something actually is the case, then I find the uncertainty to stick around longer and I remember that my assumption is just that - an assumption - and I’m more open and flexible to being shown evidence contrary to my speculative assumption.
In other words, I guess I think the figurative leads to less heavy metaphysical assumptions than the literal and as metaphysical assumptions tend to drift in my mind from uncertainty to certainty, with forgetfulness of my own uncertainty, I think it more conservative to assume the less weighty metaphysical assumption. That is why I call it the more conservative option.
Still it isn’t the most conservative option. That would probably be just to not assume anything at all. To read the passages and understand that a figurative or a literal reading is possible and then to rest with my own uncertainty about which is the case without assuming either. That’s probably the most conservative approach to my mind at least.
Without arguing maybe you can explain your definition of ‘conservative’ here and why the literal reading seems more fitting to your definition?