Every rule has an exception, and mine is the first rule - the one 'not to be broken under penalty of death'. At my workplace we have contractors that come and go, plus the in-house devs are frequently offsite. It's really difficult to get all the stakeholders together at once, and while long meetings aren't common, it definitely occurs that we have 60+ minute meetings that are full of content.
Also, rule 4 doesn't make sense for two reasons. The first is that the idea of a stand-up meeting is that it's mandatory: get everyone together to quickly thrash out what's blocking them. Just because you're not blocked doesn't mean you're not blocking someone else, plus it helps keep everyone on the same page. Secondly, the rule contradicts itself - meetings aren't mandatory, unless you need to be there. So... you don't have to be there, unless you have to be there, in which case you have to be there?
Also, rule 4 doesn't make sense for two reasons. The first is that the idea of a stand-up meeting is that it's mandatory: get everyone together to quickly thrash out what's blocking them. Just because you're not blocked doesn't mean you're not blocking someone else, plus it helps keep everyone on the same page. Secondly, the rule contradicts itself - meetings aren't mandatory, unless you need to be there. So... you don't have to be there, unless you have to be there, in which case you have to be there?