Good point, but you have Mini-B and Micro-B reversed. Mini is the old thicker connector that you don't see much any more, and Micro is the newer thinner one.

Samsung also had USB3 Micro-B (the wide connector) on the Galaxy Note 3, but went back to a regular Micro-B in the Note 4.

Yeah. GP's point is just plain wrong, if he was concerned about 3rd party stuff lasting for more than one phone purchase, iPhones are clearly the winner with only have two connector options since 2008 while keeping their form factor consistent for two generations (and there are adapters for the first switch, and possibly a third switch this fall, where adapters are still plausible all the way back to original accessories).

Samsung and most other Android manufacturers aren't even guaranteed to maintain physical dimension compatibility between different models of the same exact phone (S6 vs S6 Edge, for example), let alone if you were to just stay with Android as an OS and were switching between manufacturers each upgrade. No way in hell you're keeping any nice-fitting docks or cases around for more than one Android phone purchase.