Clay, I think Realm’s content mostly hits all three of your points.
In many cases, developers expect content to be perishable, eg: migration to Apple’s new Swift language version 3 will be 99% obsolete within a couple of years as nobody will be picking up Swift 2 codebases.
I disagree strongly with your assertion the above are actually not a lot of work because I think writing Evergreen content as a planned activity is actually very hard, to come up with original content. I would need to see at least dozens of examples before you convince me otherwise.
There is an extraordinary amount of survivorship bias when people recommend marketing and especially content-based marketing strategies.