I agree with this.
I went off on one in the post-Palace game thread a bit, and I still haven't changed my opinion. Nothing about that game gave me any real confidence. We lucked a win against Palace in a way that would not have been out of place under Moyes.
Like you said, they came to defend and counter and we nearly messed that up too. People saying we are more stable now ignore that, as well as the fact that we could have conceded three penalties against City and Hazard and Ivanovic waltzed through our back line. Even West Brom scored twice against us!
At least with the diamond we had ambition, at least when we used the likes of Di Maria and Herrera in central areas we looked a threat to other teams: Good ballers, playing two touch, give and go football. This new rigid formation has made us much less creative and, arguably, no more more stable. It also seems set up to the strengths of workmanlike players at the expense of genuinely gifted ones. I don't understand how many reds can actually be happy with that.