Subsets are better, that is great for filling the missing parts of your OS or embedding in a book or webpage. macOS doesn't really have that many missing languages, but I can't speak for Windows. And Linux definitely have them.
But, what the article is saying isn't really correct. Noto was always intended to cover everything and it is old not new, but it isn't really there yet. Only sans serif is almost complete. Moreover, and this is really the important bit, they are all designed by different designers, there is no uniformity of design.
But, all in all, this is good. It has extensive coverage. Install the sans serif and serif versions to your machines, if might help sometimes.
Here, I added some weight (15 with Fontforge) to Noto Serif for eInk:
https://drive.google.com/open?id=0Bw...lY2SW1PV2JBTjg
Nothing else is needed as the font is already nice and unhinted. I would not call it beautiful, but it is very readable and just erases its presence. That is a beauty of its own when it comes to typography.