Nice insight, thank you.
I can see that there will be a range of markets for these. Installing them in the desert (efficiency not as important as pure cost-per-watt, long-term stability very important) is not the same as installing them on your roof (limited space but fairly easy access, payback time dominated by efficiency) and so the 'customer' sweet point for these will not be the same as the 'industrial' one.
I thought that it was encrypted if your home directory was encrypted? The impression that I got was that it was just a SQLite database stored in the clear. The user must certainly be able to make queries of that database in order for it to work, so even if it's hosted by a non-user service, malware running locally will still be able to exfiltrate the data.