Yes. That is political affiliation. You might not share it, but whether same-sex marriage should be legal is absolutely a political question, even if it is now outside the Overton window.

Personally, I’m not sure I support any form of state marriage, but if it exists, it should include same-sex marriage.

An extra complication necessary to make something work. It’s generally negative.

It’s because they grew up with it rather than actively learning it. UIs have started to hide the actual details, so the users don’t pick them up.

No, it really doesn’t. It’s a kludge to allow hostile humour against people you don’t like, while protecting those you do, all while claiming impartiality.