But then, people don't know how to wash, let alone in a front loader, and let alone in a Miele.
I went from a Maytag 712 to the Miele 1918, the smaller size one. A full load in the 712 fit very nicely into the 1918. That right there just killed the capacity argument for me. There is no argument; the load fits and gets wonderfully clean. I recently pulled the 1918 out and put in the 1926. This machine is just a couple inches deeper, but seem HUGE to me. I can comfortably wash a fluffy queen comforter in it. Plenty of room in it with 2 queen sheet sets and 8 pillowcases. So, when it comes to capacity, these machines are plenty big.
I think the biggest downfall for Miele is cycle times. Now that front loaders are more commonplace, people are getting used to 1-2 hour long cycles. Back in the '80s and '90s, more than 45 minutes was pretty much unacceptable. Let alone, you only really had Frigidaire and Maytag Neptune from which to choose. So when the normal cycle is 1:47, and the "rapid" button doesn't give good results, you can see why people don't want to keep their Mieles.