You will love your Crux, Helene.
My Guru is a custom titanium road bike with couplers that allow me to break it apart and travel with it in a regular, airline approved size suitcase, without getting charged more $. It also has a rack and very low gearing. So, for the traveling reason alone, I will keep it, even though we've only traveled with them once in the suitcase. Plus, I had been commuting on this bike, because I can put a pannier on it. Since I got my Silque, I've been so in love with it, I've been either commuting in clothes I can wear all day, bringing my clothes to the clinic on days I drive, or using little backpack that doesn't bother me. Because I am sort of training/preparing to ride in France, on a bike that has 2 less low gears than the Guru, and one less than my Silque, I am sticking to the Silque! Also, I would never have only one bike. At one point, I had 3. For example, last year, my shifter cable broke and got caught up in the brifter on my Kuota. Since I had the short reach brifters that are not made anymore, we had to order the parts from the UK. I would have been without a bike for 10 days, in the beginning of the season (April) if I had not had a second bike.
I don't consider this wasteful at all. This is what we do with almost all of our time. If I want to try another type of riding, I will buy the correct bike and not sell what I have. I sold my mountain bike because it was clear I sucked at it, but now I wish I had a bike for dirt roads. I also wish I didn't sell my little hybrid, Jamis Coda.