Most likely the real reason is that articles with "experts say" in the headline performs much better than "some experts say" or "some experts wonder if".
The underlying reason for the higher CTR is that most readers want to engage with articles that are more certain than less and their inability to fill in the unstated uncertainty gets exploited.
The underlying reason for the higher CTR is that most readers want to engage with articles that are more certain than less and their inability to fill in the unstated uncertainty gets exploited.