Just bought a new Yaris

[RedRide]

Keep in mind that things like WP and alternator failures are directly related to a failed bearing for the most part

Toyota (like all auto companys) get parts from various vendors and their vendors in turn get parts from their vendors.
So, there are plenty of vendors who can inject inferior parts into the system.

Toyota has said recently that they are aware of the problems and are taking steps to rectify it..... both with their vendors and the Toyota corporate structure as it relates to quality.
They admit to growing a bit complacent about quality.