I have a few reasons...
1) My own childhood while I now realize the experience I had with "infant potty training" was vastly diffrent from the Ec promoted here I still have horrible memories. I PT pretty early before I was 18 months and I was jsut ready and I grew up where it was common to start sitting itty bitty ones on the potties at very young ages.. However I was also born with an incomptant bladder one that actually required several surguries and such so while I managed to day train well I didn't for sleeping for a LOOOOONNNNG time naps nights didn't matter when my body checked out my connection to my bladder did as well. Yet this was also a time where it was assumed only the stubborn or those that required drastic measures wet past say a year... So I spent years being punished forced to go with out any liquids for obscene amounts of time ridiculed etc for wetting and this countinued till my Jr High years where my body finially caught up. The absoulte feeling of zero controll didn't matter if it was a kinda trying to help me phase or a super punitive one I just didn't have the controll made me despise anything "EC" as an adult.
2) I too had the sensory delayed child once I learned that my parents version of EC and the rest of the world was quite diffrent I did although loosly do Ec with my DD but it was quickly obvious it was jsut ttoally making me on edge that she was making zero connections and it frustrated DH.. Then we were dealing with other medical issues DH loosing his job bankrupucy and honestly life and EC jsut didn't mix anymore.
3) the compromise. I stopped trying to guess my childs patterns I became annoyingly upsessed with it and stopping parenting to dwel over her pee and poo signs
So I stopped but we alos became the family that used simple cotton diapers with no covers so we could change right away we also became the parents of a very late trainer and I honestly don't think that would have changed had we stuck with EC I do see where I would have figured I failed her and thats not healthy. Insead we were able to stay calm remember all kids learn at diffrent rates and even use some EC knowlegment to ehlp her become successful when she was ready.
I am comfortable with the choice we made and will approach our next in the same way.