Even for extended workloads, a Pi 5 without a heatsink is still a hell of a lot faster than a Pi 4. And as sibling says, most users appreciate bursty speed while not doing prelonged compute (see also fanless laptops).
(Disclaimer, I work for raspberry pi ltd, not views of employer etc.)
I had that style of integrated panels installed on my (Victorian) house in the UK. The slates were old and crumbling so needed replacing and doing integrated panels meant only needing a fraction as much slate which saved a chunk of money. I think the result also looks a lot better than non-integrated panels, at least with slate roofs (which are common in my area)
Apparently integrated panels can be a little less efficient in hot weather as they don't get cooled by airflow under the panels and are less efficient when hotter. But it's a pretty minor effect, maybe a few percent of output. Seems like the best option on a new-build or if you're re-roofing anyway.
To look at it another way, just because some code I work on at my job is derived from open source MIT-licensed code doesn't mean I personally have the right to distribute it if my company doesn't want me to. I'd guess this comes under some generic "confidential information" clause in the employment contract.
It'll be the same as larger inverters for roof-top solar - they are constantly monitoring the mains cycle and will shut off if the voltage (or probably frequency too?) goes out of range, let alone drops out entirely. The relevant standards in the UK are G98/G99.
Two advantages for me: It's nice that you don't break the connector if you trip over the cable or put the laptop down on a soft surface, and it's nice being able to charge while still using both USB-C ports (although I guess 3x USB-C would also solve that).
I don't really see any downside to a proprietary connector if you also have the option to charge over USB-C as well.
The trick with neutral in the leaf is that you have to hold the gear selector in the neutral direction for about a second. No relation to brake pedal timing as far as I can tell. No idea why neutral has that delay given none of the other “gears” do.
(Disclaimer, I work for raspberry pi ltd, not views of employer etc.)