First, that post is more than four months old now - that or you are time traveling, as you did post it here more than five months ago.
As for the points made in that post, some can be debated on.
Anime encodes often use 10bit AVC and it has no hardware support, while HEVC has some
Encoding speed is not something that consumer should base their choice on - as long as decode is fast enough, it is not an issue. In this case though, there is no clear improvement in compression, so it is wasted time, but if there was improvement, extra time could be justified
"x265 is barely understood" and "Nobody really knows how to tweak the settings for better results" are very broad statements and could easily be wrong. There are groups that have been using it for several years and likely have some knowledge about how to tweak the settings for better results
That all being said, I am not in favor of HEVC, I am simply stating that some points used to dismiss it in past may have changed over time.
As for HDR, to me it seems like a mess of 6 (or more) different standards that have different capabilities, prices and users (BDs use one, streaming uses another and HDTV use yet another one). Some of those supposedly can work on even AVC.
Because most HDR standards require hardware support, it might be best to wait until industry has "settled down" and are no longer releasing new ones.