The problem, and the reason we've stopped using Doordash completely, is that your big tip means your order will get stacked with the low/no tippers to incentive the driver to pick them all up. And your food will sit there getting cold while the driver waits to pick up the others.
This has become universally true over the last year or two in Chicago at least. We are good tippers and every single time we'd see our food get picked up then watch the driver wait to pick up some other order -- sometime waiting 30 minutes or more with our food in their car less than a block from our home.