when the technology doesn't allow it to be economically viable yet. It's moving in that direction and I'll be onboard that train when it gets here.
I understand your reticence. My differing opinion is based largely on how many significant projects have been implemented around the world precisely on economic grounds. When they're already being installed, and beating competitors on price, I have to call them viable.
These videos talks about a number of them, and what the costs comparisons are looking like on the ground. The first one does mention green concerns (though I wish it didn't) but the narrator also acknowledges that green concerns were not enough, and that these are now winning on cost alone.
Some concerns, like storage, seem harder to answer so compellingly, but real-world installations are already happening, and accelerating. Our beliefs aside, something seems to be going on.