USB-C has almost entirely replaced USB-micro B on mid-high end phones.
The other end of the cable is much harder to replace; there's so much stuff with a USB-A that going USB-C on that side doesn't seem worth it, unless you're deep into Apple.
It would be very unApple, but they could keep a lightning port on one side, and add a USB-C port on the other and kill the lightning port later. Maybe not entirely unApple, they did go through a transition from firewire to usb on iPods with models supporting both for some time.
> USB-C was released in 2014 and adoption has been very slow, and the standard has had problems.
USB-C adoption has been pretty steady and it's on many devices of various form factors. Apple put USB-C on MacBook in 2015. The Samsung Galaxy S8 came out in 2017 with USB-C. Even my uninterruptible power supply has a USB-C port.
What problems has the standard had, in your estimation?
No offense but those are two garbage articles with no substance whatsoever and it's a joke to present them as "well documented" examples of setbacks for USB-C.
The first link is just an ad for AmazonBasics. It complains about bad cables (not unique to USB-C), differences between USB 2 vs 3 (this is true for USB-A and Micro-USB as well, so again it's not unique to USB-C), and then cryptically says "Dongle Hell Is Real" as the third problem with USB-C before talking up the merits of AmazonBasics in the section titled "Your Best Bet is AmazonBasics Cables."
The second link complains about cable quality (solution: buy better cables), missing USB-IF logos (not a functional problem and can also be solved by buying better cables), USB-C adoption (like that's some kind of product characteristic), inconsistent supported features (that's true of any standardized connector used for several different applications), and non-compliant cables.
Of a total of eight complaints, four of them can be resolved by avoiding cheap-o cables, one of them is totally unrelated to the product's technical characteristics, two of them are true of all USB standards. That only leaves "Dongle Hell Is Real."
Lightning was a breath of fresh air in the days of the USB 3.0 Micro-B SuperSpeed plug.