@Renaissance_SimWell.
To start with, I think they did improve off the grid a lot in the patch to support Eco Lifestyle (at least, I think that was the patch). I used it prior to that, and....
Anyway. I'm mostly playing off the grid for Rags to Riches, or for conservationist/environmentalist narratives. Rags to Riches, why would I pay for utilities when I own no electronics or plumbing? except then I just end up never turning it on. :D Environmentalists are doing it for what are probably obvious reasons. I had a Rags to Riches with several teens I played rotationally, one of whom had a child brother he was responsible for, and for the brothers who lived in The Shipping Views it was A GREAT DAY when they were able to buy a cooler, and A GREAT DAY when they were able to buy a fridge that worked off the grid, and A GREAT DAY when they bought the horrible used Yum Cooker, and it was SO AMAZING when they got a wind turbine and were able to cook more things.
I did have a Sim where I was experimenting to see if she could live in Granite Falls full-time without a mod. Her home lot, which I didn't really want to end up using, was the cheapest lot in the game (the $1500 lot in Oasis Springs) and she had a 4x4 floor under her tent (so it would count as a tiny house for skilling), a portable camping shower, a pee bush, and a cooler while I skilled her up. BTW, the answer to whether she can live in Granite Falls full time is "Yes, if she's a freelancer she can work from Granite Falls forever, but no, she gets a sad 'homesick' buff after being in Granite Falls for 5 days." ☹️ So she never turned on her power, but she did do the gardener, fishing, and outdoor enthusiast aspirations and then went on temple runs in Selvadorada before spending her earnings on one of the super fancy farms in Henford on Bagley, where she has both off the grid and simple living, but also the green energy generation options. TBH she'd probably be happier in a tent but she has a spouse now and I plan to have her start a family. (Also before she married her social was always awful so I had her adopt a cat.)
SO.
Earlier iterations of off the grid were barrrrrrrrrely functional, IMHO. You couldn't take a bath, but you could click your toddler and choose "bathe" and your tub would suddenly work for only that purpose, for example. So my mermaid conservationist who lived off the grid and supported her teen sister was pretty much tense, dazed, or uncomfortable 24x7.
- Tense: from tepid off the grid water, either from the quick tepid shower or from washing dishes or...
- Dazed: from cooking off the grid (apparently the Yum Cooker leaks gas)
- Uncomfortable: sore from chores, and also she fell victim to the bug where mermaid scales were permanently dried out if their hygiene ever got low once.
- (I also made them mermaids because they were perpetually tense from low fun, as the only fun items on the lot were books and a chess board. Go swimming, girls. Go swimming!)
I basically bought Eco Lifestyle for her. :D Prior to that I'd abandoned the save in frustration (see also mermaid marine biologists are constantly assigned the WFH task "snorkel," which mermaids can't do, so she was constantly Not Paid, thank goodness for gardening!).
So, what would make it better: I would like to see the wood stove possibly produce an "ouch! burned hand!" uncomfortable buff instead of a dazed "from cooking with gas off the grid" buff, especially at low cooking level. Wood stoves have a learning curve! I'd like more variety in what I could cook off the grid--I agree that you should be able to cook pies even in the horrible death trap Yum Cooker stove. (I remember panicking about how I would get a cake when it came to be time for my mermaid conservationist to age up her little sister! I'd decided that I'd find a public lot with a stove and cook there.) I don't know, more soups and simple baked items like pies and maybe not gourmet items and no cakes or cookies or, I don't know, nothing too fancy. No Eggs Benedict, LOL.. I might be misremembering but I was under the impression that medieval people used a communal oven for all their cooking? I haven't tried the grill with Simple Living, but I'm curious, LOL. (BTW, even in on grid non-simple-living lots I basically only use Quick Meals for kids who are grabbing a snack when the household is out of leftovers, so I applaud turning off Quick Meals.) TBH, I'd like my Sims to have to purchase gas if that Yum Cooker is burning gas, or wood for the wood stove (or gather wood some other way? I know EL has "bio fuel" to run "fuel cells" on the stove, but I try to avoid making my devices industrial because, again, a lot of these Sims are in the Civil Designer or Environmentalist careers).
My impression is that electric lights use a ludicrous amount of energy and I'm actually fine with that. I like giving my off the grid lots oil lamps and candles. I actually really enjoy having my Sims make candles out of bees wax, but don't do it as often as I probably should. :D (I have the bees for my garden.)
Basically, if an electronic item has an "energy efficient" upgrade I let my off the grid Sims have it, and if it doesn't they can do without. But again, I'm playing Conservationists and people who get their electronics out of a dumpster, LOL.