"if you have the fuel" is the fundamental problem. Keeping the boil going for longer will increase fuel consumption considerably.

BTW, I was off in the boiling time recommended by my questionable source. They advocate ten minutes of boiling plus a minute for every 1000 foot increase in altitude. That's twenty minutes if you are at 10,000 feet!!!

Seems like slow cooling is a really good idea.

I used to work at a hospital and a Dr told me that once water reached body temp the pathogens "thought" they were in you.
at that point they released the DNA,or something like that,which
did the damage.with no body to work on the pathogens unraveled into harmless chemical stew.

From the CDC:
https://wwwnc.cdc.gov/travel/yellowbook/...n-for-travelers

Up here, I only bring to a rolling boil for a minute. Never had problems. Of course, in Canada we don’t have a lot of the nasty things in our water as you would find elsewhere.

I’ve been parts of the world where we filtered the water thru a micro pure pump filter and THEN boiled it for good measure (for several minutes)

After all that we were still nervous about drinking it.

During outdoor activities at home however, My pump filter is one of my favourite and most used bits of gear. I only boil water not if I’m cooking or want something hot to drink. Saves time and fuel.