> Some questions really are dumb and bring no value to the table.

They do tell you that the person asking them either isn't getting it, which is valuable information, or that they are trying to ask questions for the sake of it, which is also valuable information.

Which is exactly what the OP was saying - these are the kind of questions that are often needed, but that seniors won't ask because it'll make them lose face. Juniors are the ones allowed to "not get it".