In my experience, both GNOME and KDE's pure touchscreen experience are not good as Android or ChromeOS for now, and not even close to Windows 10.

GNOME has its onscreen keyboard, although not bad actually.

I haven't been using GNOME for two years, so maybe there's some improvement?

My suggestion is give ChromeOS a shot (Brunch Framework), if you don't mind Google things.

According to relative theory, energy and mass are interchangeable, so yes.

An example is quark confinement, if you want to split quark from neutron or proton, you need energy, but even you cracked them out, the energy would form another quark, so you can't see single quark