Some concurrent writes are "a transaction can wait for others to finish, up to how long it takes for a person to grow bored" and some concurrent writes are "if

Some concurrent writes are "a transaction can wait for others to finish, up to how long it takes for a person to grow bored" and some concurrent writes are "if a transaction cannot finish without waiting the application is already struggling with a severe performance problem" (for example, because it needs multiple concurrent writes on different disks to keep up with incoming data).