Doesn't management and C-suite executives lose the respect of technical people in the company when they do media appearences and sign off this sort of overtly-optimistic PR pieces?
Which means they find some senior technical person to actually be part of the announcement, to give it more credibility. They're reading off a C-suite script, yes, but they are putting their names to it.
For sure, but it also means that they aren't getting to add their own part to the script either, which is probably a lengthy and detailed "yes, but..."