Their trends seem dated because they're not going to feed enterprises bleeding edge tech trends; they're going to go with trends that are mostly proven, so yes at that point they're probably going to be a bit stale. Large enterprises with minimal tech advocacy/leadership in the senior leadership team eat this stuff up because they don't know much better.
Frankly, if your business is struggling with operations to a point where they are bringing in third parties to get told to outsource operations, I feel like your business has a competency problem that you can't place squarely on the shoulders of Gartner.