I don't know if this was the case, though I'm led to believe it is. But it seems only users who joined the beta and used it could give feedback? Users who used it briefly and left the beta were never polled, at least I wasn't. If this was the case, using poll results from people who stayed in the beta would probably skew the results and produce an inaccurate picture of what the average user thought of the new design.
This redesign was probably going to happen either way, but polling all users might have produced other results which could have helped Nexus deal with the current landscape. Now there's a lot of feedback coming in, some bad some good, that could have been useful to Nexus during the beta. It's tricky but I do think it would have been better if all users were polled, or at the very least a specific poll for users who left the beta.