Technical management evaluates the options based on the requirements, and makes recommendations. BizMGNT shit-cans the recommendation in favor of whatever buzz-word technology is in vogue. Engineers implement the technologies chosen scratching their collective heads as to how this meets any of the initial requirements;. AND they have to engineer supporting infrastructure with no budget, and even less time to make pager-duty tolerable.
At least that's how it's worked in my experience. Someone who doesnt have to answer the phone at 2am gets to decide.