Re: On PGP [@h4rm0ny - When do we see an Windows phone with Android?]
>>"Errm... you don't. You can have as many as you want and should have as many as you need. For example, I have two for one of my email addresses--see below."
Your use case is where you have different keys for different recipients / contexts. It makes no sense to have multiple keys for a single recipient / context. And in the case of a platform key there is only one "recipient" - the public. You asked why there is only one platform key on a device - because you can do everything needed with only one and a second would be redundant.
You're really talking about two different scenarios. The correct comparison is where you have two private keys for signing and both are known to the same audience. You must understand that this would make little sense and if you understand that, then you should realize that platform keys are the same scenario. The attempt to prove Secure Boot is an anti-Linux measure is getting ridiculous. It plainly has real security uses. It also equally plainly is not harming Linux.
You are also following the familiar pattern of discarding all counter-evidence and honing in on one part of an argument and hoping to try and find some weakness in that and presenting that as the whole case. Just admit that you are wrong. Or don't - but if you take a look at what you're saying and realize that you are now down to arguing on the basis that there aren't multiple platform keys (despite there being no benefit to such), then you really should acknowledge that you are.