While I agree that triples made more sense when there were fewer gears on the back, triples still make sense in some situations. Loaded touring is one situation. Also age matters (i.e., you may need lower gears once you get older) and that might dictate a choice. If you do a lot of climbing, a triple might still be a good choice. One "problem" with triples is that they are becoming increasingly difficult to mesh with modern gearing systems so it is just easier to go with a double.

Even when I was fit and racing, I liked a triple when riding grades of 20%. Another potential advantage of triples is that you don't have as much of a jump when going from the big to the small ring up front. I'm not totally in love with what a 16 tooth jump does in terms of your gearing; YMMV.