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Depends on the grid. If the lines and transformers are already used close to their limit, more smaller buffer batteries and smaller solar installations, closer to the user, could be more efficient and not require grid adjustments. The closet to the user, the less grid adjustments are needed.
Industrial roof solar should be standard in any new building by now. Companies need the power in the day and it can be used without even needing to use the grid.
Small PHEV’s would be ideal for the current generation. Battery advances will come, but we should always try to optimize with the current technology and 10 cars with a 10th the battery of a Tesla would be better for the future.