Some bikes don't need more then a 1x, my MTB has a 38 11-46 set up and I've yet to need anything more so why have more? My cross bike is set up 46/30 with an 11/36, when I ride cross or off-road I just leave it in the 30 unless I hit a paved section or long downhill, just as I usually don't leave the 46 riding pavement. There isn't a hill around me that can't be tackled with a 38/36 but I can bail out if I need and that 46/11 is fast enough for any kind of riding or racing I might do on the bike. My road bike I used all 20 gears and haven't had the need for a triple. With modern cassettes and chainrings I think the triple is becoming redundant, a double can have very similar or the same ranges as a triple due to the limits of derailleurs. The right rear der can handle a 16t jump in the front and move through an 11-40 cassette, none I know of will handle that same cassette and a triple crank.