What I've heard Elon & JB mention a couple of times are safety concerns and concern that you need the car to be a car, not have it's range used up powering a house.
I'm not in a position to evaluate the first reason, but, the as to the second... pretty obvious most people can handle balancing that (trying not to say harsh things does make for boring phrasing, lols).
I suspect at least part of the mix is that Tesla wants to sell Power Walls and solar.
A compromise that would accommodate that last point,
Include the capability for Vehicle to Grid (well, to home) in all Tesla, BUT, only enable its functioning in the event of a major blackout. That is, just as Tesla unlocked range on software limited vehicles in the past during evacuation events (hurricanes), have a tiny team at Tesla that monitors for substantial blackouts and send an OTA to customers with vehicles registered in the region to enable the vehicle-grid.
I'm sure lots of us have ideas as consumers and shareholders... if only Elon would get around to reading my repeated tweet to him (bet he's just swamped with catching up on this thread like the rest of us).
View attachment 391782
fwiw, I've been sending this to Elon periodically for a little shy of a year now, long before Galileo started promoting a similar, but much more limited idea for shareholders to have a voice during quarterly earnings call (i.e., not trying to rip off what Galileo was part of).