*You can use it with one hand. It even brings the screen down if you hold the windows button. And you can bring it back up by holding it again. If you're referring to the hamburger menu versus ellipses, how is this even comparable to android or ios when they both have the same setup.
*Calendar is fine you're just slow
*Edge works on everything, show me something it does not work on then we can talk. It's also blazing fast.
*FB sync happens within the fb application, you have to enable it.
*difficult to clear notifications? do yo have any fingers? You slide to the right. If you want to clear a whole category, you slide the category name to the right. Oh wait... you were probably doing it one by one... lol.
*Here drive/maps all there
*No customization of sounds? What are you talking about, go to the user profile and you can have ring/text sounds. Also, you can create your own sounds using ringmaker which comes with it. There's many places. Once again you just enjoy whining because it's cool to do it.
*Call history has a search icon at the bottom, what are you on?
*settings for apps should be in the apps section, not sure what you're complaining about. People setup their app in the app not in a settings page. This makes way more sense for anyone who deals with UI.
*accounts for google can be added in the accounts section as mine is. You can then select to use it in outlook.
*integrating straight into the OS is the dumbest thing a company can do. If fb makes a change do you want to wait 2 months for an OS update or a week for the app to be updated? The APIS take care of the integration and any app can do it if the application developer decides to. It's not Microsoft's job.
Windows 10 mobile is far better than 8.1. And if you think otherwise you haven't actually learned to use it. You have 0 valid complaints. If it sucks on your phone, well that's just the way it is. My 830 runs it perfectly with no issues. And make sure you're on the right build.
Only thing I agree with is that the UI needs to be consistent. One place has hamburger menus, another place has ellipses, etc. Outlook is pretty ugly with those thin cogs and send buttons etc.. But it's still not finished so won't really say much. Hell even Windows Desktop isn't finished yet, just stable.