Why do you think that is? Is it because Google have a large team of engineers who have developed a proper security programme for the project and realised that d

Why do you think that is? Is it because Google have a large team of engineers who have developed a proper security programme for the project and realised that doing 2 and 3 are bad and that as a result of that and other problems with diong this that 4 is necessary? There are reasons for these limitations.