Oh yes they do.
I am a field tech for retail stores and see new technology being piloted all the time.
Rollouts are how they survive. Every tech refresh cycle is an enormous project handled by roaming teams who travel. I have done a 9-month rollout project for a huge chain. It was a great year. :)
At least not to the extent expected.
The closest explanation I can think of is that so much of store operations' focus is on standardization (which itself is a tough problem), that deliberately disturbing standardization seems anathema.
That said, it's definitely changing in some chains. But you'll still get tons of blank looks or red tape in most, if you want to run an experiment like that.