> and while paying $300 cash for a plumbing job is easy, it's more difficult to get $7500 in cash out of the bank to pay for a heavier renovation project.

Inflation makes this worse, too. I used to keep a handful of $100s in my wallet to pay for little odds and ends like a plumber or someone hauling trash to the dump. If I wanted to keep doing that, my wallet would have to fit a whole stack of them. The highest denomination bill printed by the US no longer even covers a night out at a mid-tier restaurant.