When you are at court juggling offers and counter offers then yes a good head for numbers is required. That’s part of the job.
On a large personal injury claim there are lots of aspects to the schedule of loss and unless things have changed, specific calculations/ deductions for the housing costs/ loss of earnings less accelerated receipts, wheelchair calculations etc.
Everything was about multipliers or years purchase and then added to that would be interest. Ultimately that might be drafted or checked by a KC but it’s your case and you need to carry it. When you are making an offer of say 3.2 million you need to be able to check your figures.
Also much of my time was spent reading forensic accounting reports and able to grapple with profit and loss accounts etc of a business owner to assess loss. The claimant might be say an orthodontist with complex set of business account or a musician etc or someone with multiple businesses that alleged were hugely impacted by the injury and not some other matter. I would not have wanted to do that job unless I positively enjoyed number crunching. To do a good job on it you needed to be able to extract the parts of the accounts not backed up by evidence ( if defendant). Although you might work with your own forensic accountant you do so as a team.
Every day larger claims involves a decent level of maths and an ability to work out accounts.
Also those large claims involved lots of biology eg a head injury when the claimant had pre existing mental health issues eg was on lithium. You might have to assess burns where the persons was trapped in the car or be conversant with malignant hypertension. I can talk easily about leg injuries and bone infections or coccyx injuries.
Frankly I would not say great essay writing skills are a requirement of a job. Maybe they might help someone doing a law degree but people converting from say, medicine managed.
An ability to be able to adapt, learn and be able to cope out of your comfort zone is good which is why a varied CV is good.