The dock connector lived for 13 years, ADB lived for about as long, and both were obsolete and replaced by better ports.
I don't doubt that one day iPhones may use USB-C or whatever replaces it, but the lightning port is going to be around for a long time - it was designed to last at least a decade, and I don't doubt that it will.
Nevertheless, the phone these are designed to be used with (the same one you mention on the 2nd to last line of your post) still charges via a Lightning port. They may be merciless about the whole planned obsolescence thing, but they aren't stupid.
Because there are about half a billion potential customers out there who already have phones that charge via lightning?