Ref PLA vehicles.

I don't think the traffic laws apply to them. I don't think the police have the power to stop them.

The don't hit anybody else is the unwritten law. However, when the traffic cop arrives he will look to see if anyone has crossed a white line illegally, or not given proper right of way. Proving someone busted a red light is harder.

I said "some of the radical vegans".

Not all radical vegans.
Not all vegans.

Jeez! Demonstrate some tolerance.

My experience

Electric
The electric water heaters are fine, if ugly. You need to make sure you get one big enough for each bathroom. Get separate tank for kitchen too.
If people are a bit thoughtful about water use there is no problem.I.E. Water on, wet body. Water off, soap body. Water on, rinse body. No luxuriating.
The good ones keep the water hot for several days, and they have a speed heat setting (double heaters).

I can see a problem with a pressure booster before the tank, it creates negative pressure behind it that may cause problems for other residences, and may even cause an airlock. They may not be permitted by the water company. I had the same issue in the UK for mains fed water, not permitted.

Solar,
Good solar heat exchangers can reach temperatures of 120 degrees, before heat is exchanged. You get what you pay for.
We have solar heating and it is crap. The biggest issue is that water feeds down into a hot water tank. The tank has a heating element to boost the temperature. However, the thermal lagging seems to have little effect, possible becuase the water is circulating in poorly insulated pipes. The water can drop from 50* to 20* in less than three hours. To make matters worse, the heater cannot be timed, and so the water is on 24/7. We tried to heat the water before bed, but in the morning the water is down to 20*.

I think to get a high quality complete system is going to cost you bigger money. And you need to ensure than having bought the best pipe, the installer does not swap it out for cheap stuff when you are not looking.

Gas
We had gas installed in Shanghai and it was expensive to run. Part of the problem is that even the factory engineers could not get the thermostat to work on the timer setting. And so the water was on 24/7, and the central heating we switched on on demand.
I have not experience with Kunming gas.

We must have been offered half price as a guest rate for the Dianchi Golf Hotel.

I usally do buy from the wet market.
Most of us do need Metro/Wallmart/Carrefour occasionally.

Yes I miss pie and chips too. I get bisto Gravy Granules sent from home as well.