I’d hardly call F-Droid dangerous, these apps are generally safer than many apps on Google’s Play Store. Sure, if you get some apk files from some shady website for the purpose of piracy, you are likely to get malware, but stop acting like installing apps outside of the default appstore is some dangerous and irresponsible thing. Your phone is a computer that lives in your pocket, treat it like you would treat a PC and you’ll be fine.
I’m very well aware of that and I never meant to imply that lightning predates USB 3.0, however, the biggest complaint that people had about lightning is that it’s limited to USB 2.0 speeds. My comment was pointing out that it would have been very strange for Apple to make the lightning port USB 3.0 when the iPhone 5 had such slow storage read/write speeds, and no user accessible filesystem. Most phones at the time used Micro-B at USB 2.0 as well, and a year later, the Note 3 came out with a USB Micro-B with 3.0 speeds, but that was very rare (I’m not aware of any other phone with USB Micro-B with that wide 3.0 connector).
USB 3.0 speeds on phones only became common with the Type-C connector, not prior to it.