Looking at that one specifically, it is very obvious you didn't like Bob's answer, despite it being accurate (he wrote Yes, along with info as to why it wasn't used), and wrote a bit of an attack on him in your post without providing anything useful in an answer. You basically said "Yes, but I don't like the way Bob wrote it"
Oh, and then you also ...
Are there any benefits for voting for any less than all three choices (1st, 2nd and 3rd)?
Does the voting robot let us get away with checking any less than all three?
The simplest way to understand it is it's more or less working like ranked choice voting.
Let's say we have 100 voters and candidates A, B and C. Our threshold for winning ...
Well, answer posts are supposed to actually answer the question.
As you say yourself, it couldn't be clearer what the question is: it's "Have light gases like hydrogen or helium been explored for ion propulsion?" I think that your first answer post is inappropriate because it does not answer that question, and I think that's why that post was ...