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#11
"dumbed down" would imply that MS was deliberately making Edge worse. That is simply not the case. IE is in it's 11th incarnation with over 20 years of development effort. Edge is in its first version, with only a year of development. No software can spring forth from it's creator with 20 years of equivalent maturity in the first version.
Many of the features you are asking about are set in the same way they are in IE, in "Internet Settings". This is a control panel app that many browsers use, including IE, Chrome, and Edge. Just because you don't see the options in the Edge UI doesn't mean anything.
As for Security zones, they are unnecessary in Edge, because Edge naturally follows CORS and other newer standards for security zoning (see Same-origin policy - Wikipedia, the free encyclopedia for an example). You'll note that Chrome and FF don't have security zones either.
Edge is lean and fast. Check out Edge's memory usage compared to IE, Chrome or FF. It's less than half in most cases, and sometimes as much as 1/10th in others.. Especially in multi-tab situations.
IE is "fast", but not as fast as Edge, and nowhere near as fast in things like JavaScript execution where Edge is twice as fast as even Chrome.