I get it, now. Most of the removable face-plate stems have to have a bulky design to allow for the 2-4 threaded bolts that have to screw in. Some of the "hinged" type (like the Modolo in particular) have a poor reputation. Perhaps the 3TTT is a superior version of the hinged type, but I can't speak from experience. Most accounts of the Frog had very high praise for it's rigidity, but perhaps the reports changed over longer term use.
There are plenty of *forged* alloy traditional quill stems that are plenty rigid and are in daily use, but then there is the dreaded AVA deathstem, too. I recall a Ritchey stem with a 2-bolt plate that looked good to me, at the time. It's sure to be out of production so, if you liked it, you'd have to find it used or NOS.