This same post keeps coming up, with slight titular variations, every few months. Which is fine, but asking for "best of" leads to people suggesting a lot of good, but not fantastic, stuff. Metal is by and large a sea of shit, now more than ever, and the best kind of shit is still, in the end, shit. I find it more beneficial to ask, what are the classics that came out of metal in the last ten years? It's a minor change, but it has a major effect in how one chooses canidates. These are the albums, from the relevant years, which I see as holding enough value to last throughout the coming decades as having a specific voice within the genre that is not matched by other albums that came before them:
Averse Sefira Tetragrammatical Astygmata
Avzhia The Key of Throne
Axis of Advance Strike
Ildjarn Ildjarn-Nidhogg (almost doesn't fit, as it's mostly composed of two pre-2001 EPs; but let's face it, it's the two new tracks that give this work its unified, magical quality) &, if we want to include non-metal works by metal musicians, easily Hardangervidda
Profanatica Profanatitas De Domonatia
Skepticism Alloy & Aes
Summoning Oath Bound
And possibly, but not as surely:
Black Funeral Belial Arisen
Lord Wind Atlantean Monument
With Avzhia's being the best of the bunch - but opinions will differ, irrelevantly in this case as all are excellent. Some will also inevitably notice a marked lack of death metal in my list - I'll freely admit I have a preference for black metal; however, I do love death metal as well, I simply haven't heard anything from the last decade I would qualify as classic.
Regardless, there have been plenty of other albums I love, and will love for a long time still. You mentioned most of them in your own list, Conservationist. But they were not in mine simply because they do not carry the same sort of discrete power, unattached to that of either their forbears or their peers(and in some cases, even their own creators' other works), that the above do.