I agree that the process could be more straight-forward, especially as, from what I read, some computers may need some coaxing into changing the keys.

But the thing is that, like it or not, most people simply don't care enough, so they'll just use Windows. I remember a while ago, when there were many live CD-based distros and there was no such thing as SecureBoot, people wouldn't even be curious to give Linux a spin. All it would have taken was to pop a CD in the drive and boot up. To paraphrase another commenter, I think many people feel the same way about their PC as their washing machine: just another appliance. Of course, lock-down platforms don't help instill curiosity in people...

So you get, roughly-speaking, two populations: those who care and those who don't. And usually, those who do care are curious enough to follow a few simple steps to disable SecureBoot for the installation and then set up their own signing process.

But I stand by what I said earlier: the process cannot be fully automatic, or it defeats the purpose. But I do think that willingly making it a pain is wrong.