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I'd disagree on all of those.
The evf on most mirrorless are superb and you adds lots of great functions like histogram and preview the shot in the view finder
On size / fiddlyness/ comfort using - you clearly haven't used a decent mirrorless. The controls on my em5 are great and it's a pleasure to use
The point about being less conspicuous is also a really good one. People just seem much more relaxed around smaller cameras