What's a unique benefit of USB-C, other than the pipe dream of "one cable fits all?" Using the iPhone as an external display? Connecting the iPhone to an external eGPU or high speed data storage array?
What about fast charging compatibility? The only difference is whether you use a charging cable with USB-C on both ends, or Lighting on one end. Since I own zero USB-C cables, it doesn't matter which accessory cable I buy for fast charging. For those who already own cables with USB-C on both ends, USB-C on iPhone would be a convenience. In other words, there's no universally-correct answer.
Since I don't travel with a PC (I'm all-iOS when I travel), the only cable I need worry about is the one that fits all the charging blocks I own. I have extra chargers, since they last longer than the iOS devices they came with. I have extra cables because it's handy. At home, my iMacs all have USB-A, so my "one cable fits all" utopia is my here-and-now. Transition to other cables/connectors is inevitable, but until my Macs all have USB-C, I'll need multiple cable types, regardless.
Altogether, a lot of noise, signifying little. Each person will support what's most convenient for him/her, and just like the notion that one cable can fit all needs, one solution will not fit all needs.