Building a thing means that there's a thing. Building a tool to build things means that there can be many things, and many people can build their own things.
While I agree with the sentiment of what you've written to the new owners of HERE, I can't help feeling there's a distinctly anti-OSM vibe from this piece. It seems like you're suggesting that HERE's data might be opened up to external contribution ("It would certainly reduce your ongoing data collection costs") as a competitor to OSM, which would only serve to fracture the open data community.
Its been years since the last OpenStreetMap API update. Partly this is a good thing as it seems to be mostly powerful enough for people to map the things which they want to, editor support is pretty good, and there has been time for documentation and tutorials to be written.
However, there are some known problems as well.
Recently, I've been hacking on adding OAuth support to cgimap. This seems like a fairly technical detail, but it's a key part of making important improvements that'll really help people editing, especially at mapping parties.
It's been almost a whole decade since my first blog post and, in a weird kind of celebration, I've just finished getting rid of that whole wordpress blog and started using something more Jekyll-like. Hurrah.