The 30-pin connector lasted from the third-gen iPod (2003) through the iPhone 5 (2012), or around nine years. Lightning has remained the connector of choice since then for the past six years.
MagSafe debuted in 2006, was improved to MagSafe 2 in 2012, and is being phased out for USB-C (which is terrible, but I digress) in 2018.
One change in fifteen years for their handheld product lineup and two changes in twelve years for their laptop lineup seems pretty reasonable.
The 30-pin connector lasted from the third-gen iPod (2003) through the iPhone 5 (2012), or around nine years. Lightning has remained the connector of choice since then for the past six years.
MagSafe debuted in 2006, was improved to MagSafe 2 in 2012, and is being phased out for USB-C (which is terrible, but I digress) in 2018.
One change in fifteen years for their handheld product lineup and two changes in twelve years for their laptop lineup seems pretty reasonable.