> until you factor in the cost of doing so and realize you would get 10x the return on adding a few more panels.

You're looking what the cost would be now and I don't think they were suggesting that, but rather as a direction of development for panels.

Luckily this is exactly how things work and why we have continues progress in the area, including with the batteries. Because 10 years ago you wouldn't even bother with super expensive Lithium batteries for home energy storage and go with NiCd, right?