I've suspected this myself, but I think they went too far. Even minor incidents are prone to breaking a micro-USB connector where a mini-USB would tough it out. But there's a bigger chance of damaging the mini-USB port. All in all I think the micro-USB connector could have been made a little sturdier without excessive danger to the port.

On the other hand, I've never fatally damaged a Lightning cable OR port, despite some fairly bad accidents (drops that land on the connector for example). The only failures were a couple where the outer coating started to come off right past the strain relief, the connector itself was always solid for me.

The jury is still out on USB-C for me. I just don't have enough datapoints, but it does seem more robust on the surface and finally (finally!) the cable can be inserted in either orientation.