I like this post for the emphasis on deep insights. I feel compelled though to address some of the points made in your post. As the originator of the buyer persona development methodology established after formative years at the origins of personas, there are some points that should be clarified. While there are good aspects for us all, I believe some of what is stated does not hold true to the tenets of personas and buyer personas. I think we are in a semantic problem also. I believe what you are describing is more akin to buyer or customer profiles and not true buyer personas.
Since the origins of personas and buyer personas, the use of templates and standardized formats has not been one of the key tenets of buyer persona development. This limits the qualitative design of personas immensely and confines them to the act of profiling. Also the purpose of buyer personas is not to have a drilling of many questions but to conduct qualitative and contextual approaches that yields the deep insights that inform strategy and innovation. It is based on skillful participation and observation with a background in qualitative research and contextual inquiry as opposed to surveys. An outcome of the profiling approach is exactly what Pat mentions in his comment - that sales will push back and say it is not useful. I've seen and experienced this firsthand whereby several clients had gone through what were called a buyer persona profiling initiative but amounted to just more embellished customer profiles that did not gain acceptance.
All the questions that Barbara has listed are great for attempting to understand content consumption. However, they do not yield a user or buyer persona per se'. They may yield a profile of how a buyer consumes content. Which in of itself is extremely valuable.
Having said all that, I do believe that your post helps to point people in the right direction - and that is to understand the value of obtaining deep insights about their buyers. And for that reason, it is on point!