I'm not sure that is really a problem of 'sorry state of power grid'. Its more like 'rapidly changing requirements'. 5 years ago, most rural lines were support

I'm not sure that is really a problem of 'sorry state of power grid'. Its more like 'rapidly changing requirements'. 5 years ago, most rural lines were supporting homes and businesses with 200amp panels (and oversubscribed, since not everyone pulls all those amps at the same time). Complaining the grid isn't ready is like putting a gas power plant in the middle of no-where, and complaining that the only nearby gas main between two towns is too small to run the 700MW power plant. Tesla can work around this by larger battery banks, or solar arrays to help recharge the battery bank faster. (they own companies that produce both). And in spots where they often can't keep up with demand, work with the power companies to get more power delivered.