You can find much cheaper batteries. But they will require additional components that are included in the Powerwall, will be less integrated, less pretty to look at, the mobile apps not as pretty, more complex to purchase, etc
They start elitist, people love them for it but that's a niche market as the top "1%" is, well, only 1%. So to justify valuation/please VC/increase revenue, they have to increase the pool of candidates which basically destroy the value-prop of their service.
I used to work for SAP Concur, not by choice but after Hipmunk got acquired by them.
Concur talked to us to use our autocomplete DB in their "new" UI because we had better results. We were using the population size of the location to sort bigger place first.
In the end it never went beyond that one call. I think they already had multiple team working on this, not necessary together (there was a big rewrite going full force with micro-service going on).
I used to work at Hipmunk, stayed until it got shot down.
SAP Concur approached us to use our auto-completion algorithm/database to power their new UI or whatever. Apparently the 2 or 3 different DB they already had for that exact use case were not good enough.
Our result were sorted by population size of the destination, The concur people could not believe it was that only that.
Amazon destroyed the environment way more than apple: fast shipping is creating massive amount of pollution, all that card board require massive amount of paper and water, most returns are just destroyed etc
In theory a 800Wh system can produce between 25kWh and 105kWh per month, depending on the location and month of the year.