I fully agree: "Tablet Mode" is a mess. I'll concede I haven't taken the time to RTFM on it, so I very well may be misunderstanding its purpose and functionality. But if that's the case, "Tablet Mode" is one of the most unintuitive software features I've ever encountered. I'm generally pretty savvy about figuring this stuff out on my own, and I flat-out gave up on this after 5 or 10 minutes back in July when I first upgraded on my SP2.
Taking the time to RTFM would be a big waste of time.
Tablet mode is a total mess -- and many of the so called-universal apps that are actually just leftover Metro apps from Windows 8, actually don't work that well in tablet mode, but are basically functional in desktop mode. So you have what are essentially, touch optimized tablet apps, that only work when NOT in table mode, which means that the onscreen keyboard doesn't pop up automatically, etc.
Edge basically sucks in touch mode compared to the lovely autohiding, multi-page views that Metro-IE had -- and the onscreen keyboard handling was MUCH better with IE (i.e. focusing on the correct text entry field). Of course, for anything useful, Edge basically sucks in desktop mode too (i.e. no plugins, which means NONE of my business sites, EMR's, etc. have any hope of operating).
Tablet mode on Windows 10 is about as broken as desktop mode is on Windows 8.1 (sans ClassicShell, that is).
Had Microsoft had half a clue, they would have realized they got Tablet Mode almost right in Windows 8.1 to begin with, they didn't NEED to fix it. All they really needed to do to fix things for Windows 10 would have been to add back in a real start menu (which ClassicShell and StartIsBack both do a better job of than what returned with W10) and to make Metro apps to where they could run in a Window (which you can do on Windows 8.1 with ModernMix anyway). So, given a free app and a $5 app, Windows 8.1 is basically about everything Windows 10 needed to be (well, I will grant that Microsoft did improve the WiFi network pages in Windows 10 -- having to use NETSH WLAN to set network priorities in Windows 8.1 was utterly moronic).