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dan-
That's without doubt true, but rim de-lamination is so damn unpredictable to make a lot of these things really unsafe. As musch as these things count for anything, my mate got a top 10 Strava time descending the Stelvio, and the following day had his wheel die on him - so whilst 'braking too much' is a possibility, it's less likely in someone who's demonstrated themselves to be good at going downhill.
The problem is, none of us know when we'll be in a situation where we need to brake a lot on a long downhill - imagine a hot day where you're caught behind traffic, for example. Or a storm breaks and you've got to keep the braking even all the way down to prevent lock-ups.
When the rim goes, it goes suddenly. No warning or anything.
bashthebox
sounds like rim brake issues to me