Well, I have zero experience of using half-frames - but I've been running a couple of Russian 'Alpine' hives (a Warre variant) using Delon wire frames, and have quite a lot of Nationals which I run foundationless very successfully using full depth frames ... so here's my take on this:
What on earth is the point of a half-frame ? If bees only attach to the top half of a side-bar - then by all means let them attach to the top half of a full depth side-bar, with the remainder of that frame still being present as a 'belt and braces' measure - because sometimes they DO make attachments further down the comb. Also - having full-length side-bars and a bottom bar in place then allows support to be given to the comb in the form of nylon fishing line (my preference) strung between the sidebars.
And - if you should ever decide to run foundationless in a 14x12 National box, it then becomes pretty-much mandatory to support such a deep comb in some way, and the only practical method of doing this is by using full-depth frames with suitable cross-pieces to support the comb. I'm currently in the process of making exactly this: 14x12 'framed Top-Bars' - i.e. solid Top Bars with 'H'-shaped frames hanging beneath them, and with bottom bars added.
So - that's my 2p's worth ...
LJ