What are members views on the necessity for turbo timers on factory standard motors?

I was discussing this elsewhere, & felt that if they were necessary that Nissan would have fitted them.
I also read a report of their potential danger. Apparently it was a turbo timer, & vehicle knocked into gear which resulted in the crushing death of Malcolm Douglas.

Does Nissan make any explicit recommendation for 'idling down' of their turboed motors prior to switching them off. I often forget & nothing nasty has happened, although I would hopefully be more mindful if I had been pushing it hard.

Cuppa