Yes, no conversion losses. No quiescent draw from needing to create a standing AC waveform. No need to size an inverter for maximum load. My gut says you'd still want some kind of MPPT/charge controller, but the article you linked didn't use one. I'd be tempted to go two battery banks for dual-ended +/- 50 volts (same trick as split phase), but 100V DC is starting to get up there so maybe not. (And if you did you'd probably want some converter to be able to balance loads between rails).
My main concern would be creating such a bespoke system that you couldn't find anyone else to work on it. But quite irrelevant when we're talking about a whole country going that direction.
My main concern would be creating such a bespoke system that you couldn't find anyone else to work on it. But quite irrelevant when we're talking about a whole country going that direction.