I think is a totally reasonable point of view and comes down to a classic cost-benefit analysis. Are you OK with using the grid as a highly-reliable, ~infinite

I think is a totally reasonable point of view and comes down to a classic cost-benefit analysis. Are you OK with using the grid as a highly-reliable, ~infinite capacity power source to smooth over your uneven solar generation at a cost of selling your excess back at a discounted rate, or do you want to try and capture that discount yourself at the cost of having to buy, install and maintain your own integrated battery backup system? Maybe the calculus works out in your favor for you, specifically. Maybe not. But it's good to have options.