I don't understand why the geniuses at Apple haven't seen the obvious flaws in our American/European/Asian/etc wall plugs and sockets and created Apple branded proprietary wall plugs and sockets that are totally incompatible with all current American/European/Asian/etc. plugs and sockets. Apple products would all use the proprietary plugs, while 'obsolete' devices with standard plugs would require a $40-100 Apple adapter. The Apple home isn't truly going to be an Apple Home until you can't plug a non-Apple device into a wall socket without forking over money to Apple for an unnecessary adapter.
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.
Asian outlets are amazingly versatile: they happily take both European and US plugs. It's a real pleasure not having to bring converter plugs with you. I am still wondering why airports all over the world have not adopted them.
Most power adapters for electronic devices will take any AC input from 100-240v and transform accordingly to the device (which cares more about DC), but definitely check before plugging it in. The Americas and Japan are 100-127v, and the rest of the world is 220-240v with a few discrepancies here and there. They also range from 50hz-60hz AC, so some devices that rely on the frequency for time may slow or speed up depending on what region they were made and where they are used.