Please read my post in the respectful tone in which I intended it to be read.
I'm no biologist, but I'm sure those pits are there for a reason.
I don't need any complicated explanation to understand that a covered heat sensing pit is less sensitive than an open one.
How much less? Is it marginal, like wearing a pair of clear glass glasses, or is it more dramatic, like wearing a pair of dirty extra dark sunglasses?
We simply can't know because the BP can't tell us. But maybe we want to be a bit more hesitant before we so drastically alter the creatures physiology.