It's not that. It's because they are optimized for low pressure differentials.

I'm sure both are true. It doesn't make physical sense or economic sense. Encasing the entire turbine with a shroud the diameter of the blades would be astronomically expensive.

However, there is no rule in physics that you can't 10x the windspeed with a focused inlet.

Natural mountain ranges around some farms have a similar effect to improve power output, but we would never consider building a natural mountain to improve turbine efficiency

> but we would never consider building a natural mountain to improve turbine efficiency

Maybe we could? Mining operations already produce huge volume of material from tailings and overburden. Not an outrageous idea to be more strategic in how and where that material is placed. Could create some artificial ranges with better wind properties.

I mean I think it's outrageous but I would be willing to look at a cost benefit analysis proving me wrong

Not an expert, but that rings true. Probably environmental impact of a huge volume of air sucked into the cone and fed into a high-speed grinder should be factored in as well.