the thing i dont like about doubles is that you have to be flipping the chain around the rear cassette loads to find the right gear. with the triple if i get to a steep hill i’ll just hit the leaver to flip it into the granny and then fine tune that cog with the rear cassette to get a good cadence. likewise for downhill except witht he big cog, and again along the flat with the middle ring.
as has been said. i enjoy the challenge of the ride so all this “there’s no point in the 22/34 because you can walk faster” is null and void (for me). yes along the flat walking would be faster, but when you reach a climb where you’re perched on the very tip of your saddle and the front end is still wandering, walking is both slower and less enjoyable. Also, you get less grip standing on a big gear than keeping a nice smooth cadence spinning while sat down.
for riding up steep hills and down steep hills, with flat bits in between, i believe a triple is still the way to go.