Serious claims are built around evidence, and the evidence takes time. Medical experts in the relevant specialties assess the injury and give a prognosis, which means their view on how it is likely to develop. Where care, equipment or housing needs are in issue, further experts assess what is reasonably required.
Alongside the medical and care evidence, financial losses have to be proved. That may mean obtaining payslips, accounts, pension records and benefit information, and in larger claims instructing an accountant to project what the person would have earned had the injury not happened.
Only once that picture is reasonably clear can the value of the claim be advised on properly. That is why we are cautious about early figures, and why we would rather explain the process and the timescale honestly than offer a number the evidence does not yet support.