Earlier quoted context omitted.
I agree that major improvements are needed. SunSpider, Octane, and Kraken are all pure JavaScript benchmarks, very microbenchmarky (look at bitwise-and in the SunSpider suite). Oort Online is a benchmark of WebGL performance—WebGL is definitely worth benchmarking, but how common is it in people's daily browsing? HTML5Test tests whether a bunch of "HTML5" features are sorta present, not whether they actually work or a…
I hate the HTML5Test (and alternative) sites with a passion for the exact reason you say. HTML5Test lists iOS 8 as having IndexedDB support but it's so broken it's unusable on that platform. Even Mozilla completely disabled it in their LocalForage library due to it's issues.
Here's the thing. Edge is IE without the legacy baggage and that's all it is. No different. It's still behind every other browser in its ability to comply with standards and APIs. Despite Microsoft's claim that it will be an "evergreen" browser, that it will update more often, we have not seen this so the proof needs to be done.