Obviously I lack any MDC experience, but your argument comparing to MWF makes sense for a good number of folks. However, I don’t think this can be universally applied. MWF is well known for being sensitive to varying water types, and if MDC lathers effortlessly morning better than MWF for some then it does widen the gap in cost per shave economy. The same can be true of nearly any soap I would think.I don't understand why some people say de Candre is good value as in cost per shave. When I tried it (a sample moulded into a pot, so it loads like from the jar), I think I was getting around 3 or 4 shaves per gram. I get that with Mitchell's Wool Fat.
OK, de Candre is a jar of 200g, whereas Mitchell's is only 125g. So that's 60% extra soap, and 60% extra shaves (800 instead of 500), but at 8 to 10 times the price! That netts out at 5 to 6 times more expensive per shave. If you get a shave that's 5 to 6 times better, however you personally rate them, then that's all well and good. Unfortunately, I don't.
Personally, I found it slow starting, which could (and did) lead to brush burn trying to get the lather working. Once the lather was built (which I had to start doing in a bowl to save my face), I did get very good shaves with it. However, it's just not worth the additional effort and expense, for me. I can get great shaves, easier, quicker, and at 20% of the cost, with Mitchell's. Maybe I should start calling it de CONdre