"Significant input" refers to information, ideas, or effort that is important, influential, or valuable. It means that what someone contributes or contributes is considered impactful and noteworthy. Full definition
Develop a rigorous evaluation process, including significant input from professional educators, to measure the effectiveness of the funded activities and to propose improvements in the respective grant programs. (ascd.org)
It also allows scientists significant input into the overall direction and control of projects even as junior members of the team. (sciencemag.org)
I would suggest that for AI to be useful for complex research (not just reference) in most legal organizations, it will require significant inputs of institutional knowledge. (slaw.ca)