I found this an interesting read.
To me here is the bottom line:
The CCIVI group's efforts to document as rigorously as possible the value and effectiveness of current vaccines produced a startling conclusion that influenza vaccines are not only cumbersome to produce, but even in seasons when there is a strong match between the vaccine and circulating strains, "the benefit in terms of lives saved, which essentially meant the elderly, was minimal at best," Sommer said.
The group seemed poised to produce a technical report that detailed inadequacies of current flu vaccines and how they're produced. "But then the research moved in an unexpected direction, one much closer to my field," he said, pointing to the team's investigation that revealed how flu vaccine recommendations lacked a strong scientific basis, leading to misperceptions that carried through in messages to the public.