I understand the intent but our BC promise doesn't cover that case, I fear doing this might send the wrong signal

While at it: what would it take to preserve the previous behavior? Would there really be a new-BC concern?

The fact that our BC promise does not cover that change is what allows us to do it. But it might make sense to document this change (probably not as a BC Break IMO), to make people reading the changelog aware of it.

While at it: what would it take to preserve the previous behavior? Would there really be a new-BC concern?

Let's say someone overrides both renderView() and render() to hook into the rendering and execute some additional logic. If we restored the previous behavior and have render() call renderView() again, that hook logic is called twice. So for someone who relied on the post-6.4 behavior, restoring the pre-6.4 behavior is a BC break. I wouldn't do it.

I updated the message to remove the "BC break" mention.

Thank you @GromNaN.