It's, in many ways, the same problem as having too many "yes men" on a team at work or in your middle management layer. You end up getting wishy-washy, half-assed "yes" answers to questions that everyone would have been better off if they'd been answered as "no" or "yes, with caveats" with predictable results.

In fact, this might be why so many business executives are enamored with LLMS/GenAI: It's a yes-man they don't even have to employ, and because they're not domain experts, as per usual, they can't tell that they're being fed a line of bullshit.