A credit check is basically relevant to any job. If you can't be trusted to pay back your loans on time as promised how can you be trusted to do your job as promised?
Bad credit, can't get job... can't get job, can't improve credit...
(they used to give away credit cards to college students working part time).
It might also show that someone has a medical condition that wound up expensive, which can happen despite medical insurance.
Many of these things do not mean that you'll not do your job as promised nor that you will steal money from the company.
When I was buying my house, I was building up and paying off ~$500 across 4 credit cards (one for Home Depot, one for Uber, etc.) I paid them down to $0 every month.
I'd consider that behavior to be financially smart. I got discounts of 5% on all those purchases because of the perks of the cards.
I was shocked by the score the bank had given me, since I do monitor my credit. They told me I had to stop using all those cards. I did, and my score went up 100 points instantly.
If you have a $50k limit and spend $2k/month, paying off in full, it doesn't really impact your score much at all. If you have $1k limit and spend $500/month it's a big risk.
You can usually make additional payments during the cycle so it doesn't impact your utilization. Whenever I make a larger purchase I just login and pay it off in full right away so it doesn't ding me.