Switching to USB-C isn’t going to speed up charging, and how much time do you spend transferring data from your iPhone to a computer?
A few people who shoot gigantic videos that they want to edit on a computer will benefit from the faster USB-C speeds, but if that’s not something you do — then it’s meaningless tech.
Charging speeds are down to Apple; the good thing about USB C is that there are established charging standards which allow devices to charge at higher wattages (ie 50, 80W, 100W etc) compared to the lightning port.
For data transfer using a cable, it varies from person to person.
For me, I backup my personal phone roughly once per month. I don't take lots of photos or videos, so the amount of data stored on my phone doesn't really change much from month to month, and hence data transfer speed isn't a high priority.
For my work phone where I take lots of photos (and a couple of videos) as part of my job, having faster transfer speeds is beneficial.
The key benefit (for me) with USB C is using "one cable" to charge and transfer data across multiple devices. The iPhone is my last device which doesn't use USB C...