Apple introduced the Dock connector on the iPod in 2001. The same connector was used for over ten years, before it was replaced with the lightning connector in 2012.

The MagSafe connector was replaced after 6 years by the MagSafe 2 connector, also in 2012.

Both of these connectors where replaced for good reasons. The Dock connector was not reversible, prone to break, and was easily clogged with dust. It was also too big for smaller form factors. The MagSafe connector was often confused with USB and also too thick for thinner devices, and it used a low charging voltage (less efficient).

Switching to a new design is often inconvenient, but also often necessary. To ease the transition, Apple even provided adaptors for compatibility with older chargers.