Oh course it's not hard
to consider whether a particular plot point is "enough of a spoiler" to be in spoiler code. What's hard is deciding what isn't
a spoiler for someone
. The fact is, every
detail can be considered a spoiler and is
considered a spoiler by someone
. The question is not
we be considerate of others?". The question is "How realistically considerate can we be before we're being ridiculous?"
The only balance that will work in the long run is for everything
to be spoiler coded always
. Plot details of Mission to Horatius
should be spoiler coded for people who haven't read it yet. After all, not doing so just because it's been out for 45 years is inconsiderate to someone. Isn't that vague unknown "someone" important enough to think about when you post?