I recently found myself grateful for the 73-degree quill stem when I fitted myself to this admittedly-large Centurion thrift-store find.
I ended up removing an intermediate threaded lockring from the original headset, then making an open-top "shorty" hex locknut that fit flush with the end of the shortened steerer.
And to get the handlebar height just perfect, I put a radiused notch at the inside front of the end of the steerer to accommodate the inside bend compound radius of the original Nitto stem.
I didn't think I would quite get there, but I did, with the perfect 2-3/4" drop from saddle to bars I was after. Long legs makes the standover height a non-issue for my mere 5'9" skeleton, incredibly.
So I would say that the 73-degree quill stem makes sense, within the wide range of adjustment possibilities that it was intended to facilitate.
And, most ironically, this factory-supplied stem is a Technomic!
Before-to-after:
