Re: Microsoft made it clear that security has taken a back seat
Having written many installers (with InstallShield, InnoSetup, InstallAware and lately Debian packages too...), most desktop applications usually have installers simple enough to write. Some large ones may have some more complex one. Server applications, especially the large ones, may have very complex installer, especially when you have to initialize or upgrade them and upgrade/migrate settings/data/etc. - but this will be still complex in UWP, just it is complex in other OS.
And didn't MS already promised "one-click install" with .NET applications?