The iphone 6s battery could not last more than 18 months of daily use. After that it would not provide a stable voltage, causing the phone to randomly shutdown. The "fix" was sneaking in a permanent throttle at 20, 40, 60% of normal performance to hide the problem.
The new keyboards in the recent Macbook Pro redesign are hyper-fragile to the point that Apple's own service technicians have trouble fixing keys and end up having to replace the entire thing.
The Mac line has a history of graphics card failures due to excessive heat from poor thermal design.