I will start by recognizing that the transportation, trip view and wineries visited were very good. Each winery host was good as well. My main complaint and/or disappointment is that you are visiting these places to learn, not just get a 5min speech and then it all becoming about drinking/tasting the wines considering the amount paid is not cheap. And of course, wineries expecting you buy something.
I think you can combine the wine tasting experience with, for example, a video that shows the wine making process that for me is key to see and complete the full tour experience. Another suggestion could be to be able to see, if feasible, a live (or replicated) part of the process wine making process in front of visitors. From both, the video is probably the most feasible and I think it's not a big request to make to these wineries, since doing these things will definitely step up the experience.