2014 Lexus CT200H Engine problems

Engine started misfiring recently at engine cold start and from hybrid transition to engine startup. Engine light came on with reports codes P0302 and P0304. Additionally, another error code P0607 also was detected. Had a certified mechanic assess the car and replaced the four coils for the CT200h. No change in issue. New issue developed this past Monday with an engine temperature light flashing on. Stopped and put a half liter in the coolant reservoir. Engine temperature light did not come back on. Took the car to...

Engine rattles due to head gasket failure and subsequently stops working and defaults to "service hybrid system" this can occur while driving and cause a collision.

The head gasket is leaking. After speaking with several mechanics who work on this type of car and issue and they have all said that "3rd generation prius engines all have this leaking head gasket problem, no other generation hybrid engine from toyota or lexus does". Why wasn't this recalled? I don't understand how toyota and lexus get away with a shoddy product that creates a $5-8k expense on their vehicles that is a design flaw and issue with this generation hybrid engine. My car is only worth about $10k, so...