The Skyactive 2.5T is used in just about every platform Mazda has (CX-30, CX-5, CX-9, 3, 6); many of them are high-volume sellers. I think the only vehicles that don't get the 2.5T are the MX-5 and CX-3. Given it's broad application across their product line, if there were a propensity for problems, I'd think it would be far more obvious. Yet this is the first major mechanical issue I've heard of in recent years regarding this engine.
This example seems to be a rare failure and it's good fortune that the OP had an extended warranty.