some types of users (namely finance and audit people in that case) very often don't have accuracy as a top item in their agenda
That's a silly assertion that you can't back up, and it directly conflicts with my own experiences actively seeking out and correcting these types of inaccuracies because it caused so many headaches and problems and overwork for finance and audit people.
Even so, regardless of all of that, it's still nonsense to claim "Rakudo does numbers right!" when it's clear that there's (as someone else put it) a hole in the bottom of Rakudo's number handling, and then to claim that it doesn't really matter because you don't think people care about this.
It's this type of bizarre Rakudo advocacy that makes me wonder why anyone still bothers.