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hasn't this always happened with internal connectors? SATA rev 1 (1.5Gbps, 2003) used the same connector as SATA rev2 (3Gbps, 2004) & SATA rev 3 (6Gbps, 2009) so drives and motherboards plugged together and operated but at the slowest common speed between them.

is USB-C somehow different that people expect Thunderbolt 3 (Dec 2015) using a connector introduced in Aug 2014 on a 12" Macbook announced in March 2015?

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No, this was always an issue, even in times when you enjoyed yourself with incompatibilities between different RS-232 implementation, VGA cables, DVI digital/analogue mess, FireWire burning out ports and more.

The world where a plug was enough to identify underlying protocol in 100% of never fail cases never existed.

However, nostalgia deletes enough memory for us to whine about times that never existed ;)

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