Did you build a shower with a neo angle?
A shower with multiple niches?
Did you flood test the shower? This must be your fourth shower build todate? Is that right? two for you, one for your sister and I think your Mom's place if my memory is correct.
When designing barrier free showers and installing linear shower drains Kerdi's greatest weakness (the dry set thin set rule) held me back and made for inferior shower builds. So I retrained myself in the other systems. Now three years later I can look back and review all systems since I have infact used them.
I love sheet membranes. Noble Seal TS is a hands down winner over Kerdi.
Remember Jim Kerdi is to my knowledge the thinnest protection in the business, at times only 4mil (4 one thousands of an inch) or roughly 1/7th the thickness of your credit card separate your shower from one that holds water to one that leaks.
Jim if you where in fact in this business (perhaps working for John Bridge or Schluter) and where like me building showers your opinion would be varied. If you didn't spend so much time on John Bridge's site getting brain washed you might see the light.
To say I don't understand Kerdi is wrong. I prefer better systems now for my clients because I have had more training and been exposed to better systems - that's all.
NTCA Survey Update of drywall in showers