Agree, why can't I just visit a website for x, hit a button in my browser to download and install their app. Security? Well, shouldn't the OS/sandboxing be han

Agree, why can't I just visit a website for x, hit a button in my browser to download and install their app. Security? Well, shouldn't the OS/sandboxing be handing that for me? Malicious apps or scam lookalike apps? Surely a similar system to ssl certs can be used.