There's a huge difference in the POV of the presenter and the POV of a home winemaker desiring to improve their wines. The presenter is presenting their wine, providing information regarding wine appreciation and pushing wine sales. Probably focusing on the latter more than the former.Discussions of terroir and climate are all very interesting, but I don't just want to hear about your wine, I want to improve mine! Am I asking too much?
Based on my own experiences with wine tastings, I don't expect the presenter to know much about grape growing and/or wine production. This avoids disappointment, although it's nice when the presenter actually knows something.
A panel discussion with successful commercial winemakers would be a better venue, assuming we can find a reason for them to join in.