Yes, that would be the sole reason ..... ergo: nm-manager is supported widely over all distros and a lot of tutorials use it as an example.
People in general tend to use Howtos coming from other distros (think Ubuntu) and expect them to work across any distro.
Frankly, nm-manager is the better option (albeit connman predates it) ....... I'll look into using/adding tint2 systray functionality to E24 in short notice.
I'm still procrastinating writing the Howto on the E16 minimal desktop, after that's done I'll start dissecting E24 (again). 
