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.