For sake of a simple example, consider designing a rechargeable flashlight. For whatever reason, you'd like it to be rechargeable over a USB-C port. You also want the flashlight to charge as fast as possible from whatever power source you connect it to, because you know people will need to charge it quickly. To do that, the ideal solution would be a single IC that sits on the USB port and monitors D+/D-, CC1/2, and the rail voltages and sets a few GPIOs to tell your battery charge circuit what is and isn't allowed on this port.
Inexplicably, _that chip doesn't exist_. It does exist for USB 2.0 (that is, BC1.2), available from several vendors, and works perfectly. There are solutions marketed for Type-C... but they don't touch USB 2.0. That means someone who uses a Type-A to Type-C cable with a beefy older Type-A charger doesn't get fast charging. There are some bigger Type-C products that might work, but they're incredibly complex, physically large, expensive, often in BGA packages, and will blow out every line on your budget.
Admittedly it's been about a year since I turned over every stone in the industry searching for my Magical Unicorn Charging IC (like the ones that exist for USB 2.0...), but I do pay attention to new product releases and I haven't seen anyone going in this direction. Probably you could get something customized (at medium volumes) or certainly full custom (at high volumes), but if volumes or margins are low enough to require COTS parts, there really aren't any workable solutions.
I am confident that Type-C's market penetration will skyrocket as soon as the difficulty and cost of actually integrating it into a product reaches sane levels.