Warming down - how long and how hard?

So I've recently been using the Zwift 2x20 workout for doing 2x20s. This finishes with a 15 minute warm down, firstly at about 75% of FTP and then eventually ramping down to around 65%. To be honest it seems slightly overkill, I'm more used to just gently spinning at about 100w for 5 minutes to cool down. It's a bit of a chore when you've just finished a knackering workout and I sort of feel I'd be better off getting my recovery drink down me asap instead of faffing away at tempo for quarter of an hour..
Is there a real benefit to this sort of long and "hard" warm down?
Is there a real benefit to this sort of long and "hard" warm down?
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https://well.blogs.nytimes.com/2014/04/ ... necessary/
https://www.nytimes.com/2017/03/08/well ... oesnt.html
Stretching & Workout Vids
All that said, the times I have religiously followed the cool down and sat there dribbling at 120w for 2 mins watching other riders fly past me .... when I have got off the bike I have felt like I never did a work out, by body has cooled down, but not gone in to refridgeration mode and starting chilling me beyond whats required. ... so perhaps it does work ??? ... but who got time for dat !