I totally agree with everything you've said 👍 And I’m one of the ‘drive slower, save fuel, relax a bit’ crowd these days.
Despite me having a Tesla with ludicrous which is still in the Top 10-20 fastest accelerating cars on earth.
Some people cannot think for themselves. They need rules to tell them what to do. Of course it’s perfectly safe to drive over an arbitrary limit if the conditions are such that it is safe (and you’re on your own, or with someone who consents to you doing so).
It doesn’t mean it’s legal - far from it and if you are caught you say ‘it’s a fair cop’ and you deal with the consequences. But blankety saying ‘that’s dangerous’ is the hallmark of someone who doesn’t understand the concept of people have different levels of ability to assess conditions, different vehicles etc.
I never break the limit in a 30 and only very rarely in a 40 because I’m concentrating on the road, not the speedo. Because there isn’t a need to, the likelihood of hitting a child or something unexpected happening is very high etc.
But on a clear NSL road in good conditions, the ‘danger’ factor of driving above the limit is an assessment that can be made by the driver. If you cannot assess the safety of doing so then you have no margin of error in your driving abilities.