If you need a gear below 34/28, then th etriple makes sense. so if you wan the ability to use the 12-30 with a 26 front ring, the triple's almost a neccessity.
However, the 50/39/26 with 11-23 setup is easy to virtually duplicate the useable gears with 50/34 11-28.
That's gives you a smooth progression, with one cross over shift at 50/19 to 34/14. You are going to have to make a double shift there, but I'd gladly take that in exchange for less weight, less complexity, better front shifting.
And as for a smooth progression from 18-30mph, at 90rpm on the 11-28 setup that is all on the big ring, and the largest jump is slightly over 1mph.
With 10 and 11 speed cassettes, and compact cranks, Triples just aren't necessary to get good spacing. They still are good for very low gears.
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