Well you can disagree... ( dunno what you are disagreeing about though... this was not speculation on my part, rather a recounting of something that has actually occurred. )

But the problem still happens on a "proper" setup, with the correct adapters.

The spinner is held by the spinner cap screw onto the adapter nut.

In turn this pushes the spinner cone against the backplate.

My spinner kept coming off during starts.

So I kept tightening it down, which eventually broke the backplate.

This is easy to do, and since the aluminum doesn't have as much give, it cracks quite easily which is extremely dangerous.

It's not that I dislike aluminum spinners, but they are simply not the end all, in terms of safety, as I've experienced first hand.