^^^ Some years back I was at my agent getting quotes for auto insurance. She punched all of the information in and then sort of blinked at her screen. Looked at the numbers a couple of times. Made a comment she'd never seen such a discount based on credit score. Not sure exactly which numbers she was seeing, but it knocked enough off my premium to make her notice.
My tractor loan was approved without any hesitation.
Even if you pay your cards in full every month, you're still 'profitable ' to them if you use them due to the swipe and other transaction fees they get for every purchase.
If you don't use a card, they may either reduce your limit or cancel the card altogether for non-use. I had that happen once several years ago.
To maintain and possibly improve your scores, rotate your cards. Use each one every couple of months, but don't charge more than you can pay off in full at the end of the statement period.
They also look at credit mix ... cards, loans, mortgage, etc. When I paid off my tractor loan recently, my scores dropped due to 'no secured loan'.