It's not the 90's when you had to leave a turbocharged car idling after giving it a hard run so that the oil would keep pumping around the turbo to cool the bearings.
But isn't this precisely what is recommend by the 'experts' to prevent oil carbonisation in the turbo bearing oil feed tubes which ultimately leads to turbo failure?
The only time I usually apply this strategy is when I pull into a service station after a reasonable motorway stint. But mostly my journeys end with some town running where the turbo and the oil cool down anyway.
Turbo cooling nowadays is so good that it doesn't take any lenght to cool the turbos. Unless you're flooring it continually on the motorway or driving at speeds close to or above 100mph then there will me more than enough air going through the oil cooler/s to keep the oil cool enough.
The last time I had a problem with a turbo was in my R5 with a R21 turbo engine conversion, and when I say problems I mean big problems.
Not saying people don't have turbo problems now but they are usually from a part failure and not under cooling.