It’s not really the intended use case of Lua to be used in things that will be upgraded after they’re released. It’s meant for things that need to work exactly the same way in a decade as they do now, and that’s best served by sticking to a specific version and either only upgrading to bugfix releases, or sticking to one specific commit forever. Those use cases also are better served by sticking to old versions of any libraries they use that are written in Lua (otherwise they might be hit by regressions or turn out to have been reliant on old buggy behaviour that’s been fixed), so probably aren’t upgrading to newer versions. That’s why the article is making the point that it’s not worthwhile for the maintainers of those libraries to keep compatibility with old versions of Lua as the people still using old versions of Lua are probably going to be sticking to old versions of those libraries, too.
In the UK, it’s because it’s the defence’s job to notice this kind of thing, but paying for a good lawyer is life-ruiningly expensive, and public defenders via legal aid are paid hourly, but have a cap on the number of hours that’s never enough to deal with anything properly, so are either rushing everything and miss things, or are massively overworked and earning well below minimum wage when their unpaid work is included.
I don’t know if the same problems extend to Canada, but it’s fairly likely, as the adversarial approach just inherently means the defence has to do loads of things that would be someone else’s job or not need doing at all under alternative systems, so you have to have a trained professional doing lots of work, and that’s inherently expensive, but taxpayers don’t like spending money on defending people who probably did crimes.