I strongly disagree with this. In practice, supporting chrome does not imply supporting safari and vice versa. In particular, Safari is much, much slower about adopting new web technologies. Google basically implements support for anything they can think up, Apple waits for it become a ratified standard and then implements it only if they want to. Their JavaScript implementations are also completely different.
And what would Apple be able to do about it? They don’t have your password*, so they’ll be just as unable to decrypt the device as the police.
*you can give them your password via iCloud I believe but you don’t have to