I've had plenty of Mini-USB failures, all of them in the socket. There's a reason why when Micro-USB was designed, they bumped the required mating cycle rating to twice that of Mini-USB.

The biggest problem with Micro-USB, is that it got adopted as the standard charging port for smartphones, which proved even the doubled mating cycle rating way insufficient.

For reference:

• USB-A, USB-B: 1500 cycles (but they tend to stay put)
• Mini-USB: 5000 cycles (good for sporadic data transfers, and once or twice a day charging)
• Micro-USB, USB-C: 10000 cycles (better for daily charging, not so much for many times a day)
• Magnetic adapter, Wireless: until it burns out, but not so standard.

If you had problems with Micro-USB, expect about the same to happen with USB-C. Plugging it once a day to charge, should last 30 years; plugging it 10 times a day to "top it up", will break it after 3 years on average.

Personally, I've put some magnetic adapters in all Micro-USB stuff like 5-6 years ago, and so far only one of the adapters has broken, all sockets are like new.

I'm sure the cables work but I can assure you the terminals on devices eventually do fail. I had to replace one on my old android phone.

mini-usb cables are robust, but the sockets they plug into were pretty fragile, i’ve had multiple break.

Interestingly, Apple has donated the phone version of MagSafe to the Qi open wireless charging standard. Soon we’ll see a magnetically aligning wireless charging Qi2 devices from other manufacturers.