Don't mean to contradict anybody, just my observations!
I have a limited number of sites that are typically referred to as EMD sites (micro-niches; few pages; main targeted kw=domain name=website name).
Only one of these got hit with this update! As usual, this was also the best of the lot, meaning the one earning the most money and the one best optimized - on page and off page.
All the other EMD sites that didn't get hit - on page factors were optimized almost as same as the one that got hit, but I hadn't done off page optimization - no hardcore link building campaigns.
My conclusion = the update didn't just target EMDs, but it targeted over-optimization. With an EMD site going after one keyword and one anchor text which also happens to be on the domain name, H1, 1st sentence, internal links etc. etc., over-optimization is more obvious/easily detectable by a algorithm change.
In contrast, a larger (authority) site would go after multiple keywords/anchor text, and these keywords are not necessarily on the domain. Therefore over-optimization for one or few keywords, both on page and off page are almost impossible.
I also see changes in rankings for authority pages whose title tag looked 'over' optimized. For example there's a page in one of my niches with a title tag like 'best electronic bed raiser chairs help weak people get out of bed' (obviously I made that up). If that was the real title tag, 'electronic bed raiser' was hyper-competitive and 'best electronic bed raiser' was less competitive.
The above page jumped from #3 to #1 for 'electronic bed raiser' and fell from #1 to #3 for 'best electronic bed raiser'. The YouTube video that jumped from about #5 to #1 goes "what is the best electronic bed raiser". "what is the" makes it less over-optimized and thus Google ranked it above the other which was more over-optimized.
I see that kind of a pattern on several other pages as well.
To wrap it up, it looks more like an over-optimization penalty and the presence of the EMD makes those kinds of sites more vulnerable to such penalties.