How do you know how secure it is?
Please list known security issues with the platform.
Any platform is only as secure as it's known to be, and that security opinion varies on who is making it.
- End user knowledge of security flaws.
- Manufacturer/Developer knowledge of security flaws.
- Cyber-criminal knowledge of security flaws.
If you're an end user, you don't know that Blackberry is publicly listing all known flaws. There are likely a bunch more that are not disclosed for security reasons until they can be patched. So asking someone to produce a list of flaws, and calling the absence of a list of issues proof of the platform's security is fucking bullshit.
If you're the company responsible for the OS, you're not going to know about all security flaws that may be getting exploited. You have the ones you find in testing, ones reported by end users and White Hats, and maybe you have a mole or other "ear to the streets" with info on what's being exploited.
If you're the hacker, how do you know all the flaws you're aware of and the perceived "level of difficulty" are true? There can be flaws that are undiscovered or only known and exploited by certain individuals or teams that would make your malicious activities much easier if you were in the know, too.