Thank you all for your contribution to this topic. I think we can all agree, well, almost all
that with upgrading to Windows 10 mobile we lost features that we care about and love, making our experience on this platform unique compared to others. I'm well aware that there are workarounds for apps missing and as well some features. Apps like FM, Health & Fitnes, Travel and Food, Gestures and so on will surely be missed, especially because there are no real alternatives to them. Sure Tunein and 3rd party FM can somewhat replace FM, but the experience is not great as it was on default apps.
Maybe one day we will see features like tap to wake on last gen devices and even stuff from Gestures beta, as we recently got swipe left/right in Edge. Hamburger menu, really bad implementation in it's current state could be fixed by adding system wide swipe option that's been included in marvelous apps like Groove and Windows central.
Loosing features due to upgrade is unprecedented, and have never seen that on other platforms, correct me if I'm wrong.
Let's not be ungrateful though, we got some really great features in Windows 10 mobile and as Insiders we got a sneak peak into birth of an OS, along with option to give feedback. We as insiders and feedback providers have power to influence development to a certain extent, like in OneDrive example. Give feedback or upvote existing so we can, hopefully, get stuff we miss back!
P.S. What I really miss the most is theme color sync between phone and PC and vibrant color phone cases in x50 generation. With same color palettes on both operating systems it should be easy thing to do with a toggle option in settings.