Perhaps you can write a patch or mitigate effects of (say) an OpenSSL bug. I can't. Certainly not for the myriad of devices that embed well known libraries in firmware images that I don't get to modify myself.
I'd much rather that those things which are remotely exploitable across millions of devices to be kept quite for a small period of time (30-90 days depending on the complexity of the fix required) so that I can get patches from our vendors and schedule an update at the first available opportunity.
You might call it security through obscurity, I call it keeping shit from burning down.
