I think it's being embraced more freely now because it's been achieved without losing the deep integration and sensible defaults that caused them to fall in love with Rails in the first place. I'm personally thrilled to be getting the best of both worlds.

Now if we could just do something about speed...

Does that 60% figure include transmission losses, or is it just thermal efficiency? I'm guessing the latter.

The industry standard for measuring the efficiency of a power generator does not include transmission losses.

However, I have seen people include it in the past as a way of manipulating the numbers. I doubt this is the case with this number. It should be close to 60%

If it doesn't include transmission losses, then how can you meaningfully compare the net efficiency of a colocated device vs. a remote power station?

Transmission losses are probably not included, but for reference this new device is only 35% efficient if you cannot use the heat it generates. If your house (or the weather) is already warm enough, you're not going to come out ahead.