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"Every few years"

There have been three versions of MagSafe (not "Magsave"). The first one was in use for 6 years, the second for 6 years before it was dropped for USB-C. The third version has been around for two years worth of devices now.

https://en.wikipedia.org/wiki/MagSafe

MagSafe was introduced in 2006 and has had exactly three iterations. “Every few years” is a bit of a stretch.

There’s been three in total and the new one works concurrently with usbc and is an optional, nice, extra.