I don’t understand. Your post is very technical and you definitely know your stuff, but I’m unclear on your conclusion. How can I protect my home, and in the future my Powerwalls, from being damaged by the power company?
What confuses you? Complaint without citing even one sentence only protects confusion.
Why did you not find those expressions in "spec sheets for well-regarded ups and surge protectors"? Because
a UPS is temporary and 'dirty' power so that unsaved data can be saved. It does nothing to protect hardware.
Since a 'magic box' only does H-N and H-G protection, then it does not claim to protect from potentially destructive surges. Since it does not claim effective protection, then relevant expressions are not found.
A protector without earth ground is a profit center. Protection inside all appliances (including a Powerwall) already does better protection.
Nothing in specs for a 'magic' UPS or power strip claims to protect hardware from exploding transformers or grenades in NV. But effective protection from the relevant threat was detailed.
Stated at a layman level.
Protection is always about connecting that current to earth BEFORE it can enter the building. Then that current is not hunting for earth destructively via appliances.
Or
the informed homeowner earths a 'whole house' protector for about $1 per protected appliance. Why earth? Because protectors never do protection. An effective protector always has that low impedance (ie less than 10 foot) connection to single point earth ground (all four words are electrically significant).
What is complex? 10 feet? $1 per appliance? Earth ground? 50,000 amps? Hundreds of thousands of joules? Once every seven years?
Go to a big box hardware store or electrical supply house. Ask for their 'whole house' protector. Confirm it is rated at least 50,000 amps. It must have a dedicated wire for a low impedance (ie less than 10 foot) connection to earth ground. Then hundreds of thousands of joules are harmlessly absorbed outside. Then best protection already inside all appliances is not overwhelmed.
Powerwall, like all appliances, already has robust protection. Your concern is something that might overwhelm existing protection. "well regarded" products do not claim to protect from a transient that might overwhelm that already robust protection. But one properly earthed 'whole house' protector does - recommended by numbers.
An example demonstrates this simplest and effective solution.
A telco's CO will suffer about 100 surges with each storm. ... How often is your town without phone service for four days while they replace failed hardware? Never? They also properly earth 'whole house' protection. Same solution that every homeowner can install; provided by companies known by any guy for integrity. Best solution is also how it was done even over 100 years ago.
So simple that it was understood and routinely implemented over 100 years ago. And not found in any 'magic box' that plugs into a receptacle.
If not yet obvious, most of your attention and most questions must focus on the item that harmlessly absorbs hundreds of thousands of joules. Only that item does the protection - single point earth ground.