I feel like actually being to try a bike is overblown. People aren't good at judging what they are experiencing. And the fit on the test bike is probably different from their normal fit in significant ways. Which has tripped up people trying to do serious bike reviews in the past. I know that if a bike has an extra 1" of stack height, it's going to feel bad to me, very slow. I try not to let that happen, but a lot of people don't know their preferences that well. Someone here bought a custom frame that the LBS built up and the customer was really unhappy with it. Then the shop realized they never did a fit. After they did matched the customer's usual fit, it was fine.
How many shops are going to that effort for a test ride? It's not zero, but close.