I was all on the 1x train after my first ride on my 1x CX bike. I was all aboard...
My fitness wasn't great, I was a bit heavier than now. The 1x11 did everything, met all of my needs. Easy climbing gears, enough gear for cruising and the occasional higher speed run.
Now I like it for the designed purpose - offroad, gravel, single track. It's nice not to worry about the front mech when knocking around off road.
Now that have better fitness and less mass - a 2x11 on the road with a 1 to 1 option is the best for me. I can climb just about anything, and I have enough top end for higher speed runs.
My 3x9 is fairly useless. Many of the gears overlap and I probably have fewer actual choices and range than the 2x11.