SMB/NFS Shares should be mounted into the local filesystem. Until now you'll need tools like smb4k to do this in an uncomplicated way. KDE Plasma should be able to handle this in userfriendly way and support both Samba and NFS Shares.
Yeah, agreed. Also this is currently being worked on for a GSoC project. See https://summerofcode.withgoogle.com/projects/#5417220300079104 and https://bugs.kde.org/show_bug.cgi?id=75324.