An improbable and illogical scenario, yes? And yet, it is perfectly normal to encounter the same mentality when it comes to cycling. One question I get asked that absolutely puzzles me, is whether I am "moving away from upright bikes" now that I am comfortable riding a bike with drop bars. What?... Are joggers "moving away from walking"? Similarly, I am perplexed when some congratulate me on becoming a "real cyclist", now that I can ride a roadbike and a trackbike. I suppose that means that joggers and track runners are the "real pedestrians"?
Just like there are many forms of pedestrianism, so are there many forms of cycling - each serving its own purpose. The distinction between upright city bicycles, roadbikes and mountain bikes is not so different from the distinction between walking, running and hiking. Walking is a casual form of pedestrianism that is the most natural and low-maintenance way to travel from point A to point B. It is done in one's everyday clothing, while comfortably carrying items on one's person. Taking up jogging or hiking is all well and good, but you'll probably still want to walk to the grocery store.
My upright step-through bikes are my "walking." They are essential to me, no matter what kind of other bikes I ride for fun or exercise. I am more comfortable than ever now on a roadbike, but when it comes to work or errands or pretty much any kind of city or transportation I will always choose the upright bicycle with a step-through frame, fenders and racks. As with walking vs jogging, there is no "war" between these two forms of cycling as far as I am concerned. They co-exist, each in their appropriate context.