iOS suffers from more such graphicall issues, aren’t they gonna be addressed?
Every computer known to humankind is subject to unexpected behavior that can be resolved by a simple restart. If the same fault keeps reoccurring (and occurs to a significant number of users), then we usually consider them bugs. The conditions that lead up to the fault can be duplicated and analyzed, and the software or operating environment modified as necessary.
If they happen once then they're not bugs, they're just accidents. Nobody was hurt, just move on with your life.
But sure - everything should be perfect. You want to make sure that someone can't crash their car into another car, or cut a finger on a broken shard of glass, or pour too much milk over their breakfast cereal?