You're making an assumption that this was a landing gear problem, that hasn't been established yet!
A landing gear fire like this (if it was a fire!) could well be caused by landing back overweight and at high speed and the brakes then overheating. All that the press release says is that it returned with a mechanical failure - could have been an engine, or several other things!
This was a well publicised (& televised) event. I can recall an event some years ago, where a 737 landed in the US with the starboard main gear retracted (also televised) Landing gear related incidents are extremely rare on all certified transport a/c, and are usually caused by external events, such as overweight landings, rather than mechanical issues.
I flew A319/320s for 4 years, and had a couple of BSCU problems (Brakes & Steering Control Unit). The gear and steering on the A320 are more electronically controlled than in the 737. Apart from that, I had no problems with the ldg gear/brakes or steering nor my confidence in them!
I agree, especially if the 'fire' was as I suspect above!