They're both equally easy to use, lightning is just slower. Seems like it's just your personal case, I have 0 lightning cables and maybe 5 usb-c, it would be equally a waste to throw them away.
Also, nothing forbids evolution, usb-c evolved a lot already, you just have to make it backward compatible. I haven't bought a usb cable since I got my pixel 3 and everything works just fine
Anecdotally, while I've had usb-c connectors break off about as often as lightening ones, the lightening cables seem to just stop working sometimes, and I've never had that with even cheap usb-c cables.
As for evolution/innovation, sure, that's a real downside. Seems like a quite small price to pay though because it is just about charging. And if I understand this correctly, you can still innovate and add Super Charge 3000 to your device, it just needs to have USB C charging as well, and you need to be able to opt out of getting yet another charger with your new device.
As for working on actual stuff: They can do both - Regulating mining would be great, but this is also good.
We are not most people. Most people get yet another lightning cable with every Apple device when they could just use the cables we all already have for other devices. I also have a bunch of lightning cables because each device came with one, but, at least, they stopped coming with power bricks.
> I am livid that they’d do something like that instead of working on actual stuff like forbidding mining
This is not an either/or thing. Other groups are working on doing that without causing supply chain collapses and crashing economies. It's a very complicated and chaotic system with tons of interesting emerging behaviors.