AndrewClarke
Adventurer
I'm not saying they are not needed, just that the cooling system on LR's is very capable if in good condition, one of the few things LR did get right with their vehicles.
That depends on your point of view, and what you drive where. When I lived in southern California and had a V8 Disco I, I really don't think the stock cooling system was up to the job. That vehicle had quite a few overheating problems. Some were probably user-related, but I had burst hoses in Death Valley, overheating while in stop and go traffic on the freeway, and I lent my truck to someone and when I got it back it needed a new engine thanks to them overheating it.
The diesels fare a lot better, so in the end it depends a lot on your specific situation and environment.