99 % of smartphone users don't care about USB-C transfer speeds because they only use the port for charging. Maybe a fraction of these users uses wired CarPlay, which works the same with USB 2.0 speeds. Maybe some users use a USB-C to headphone jack adapter which works the same as well.
There's a tiny fraction of users that'll ever notice the speed difference (because they use the port for actual data transfer) but they won't find reading a spec sheet confusing.