Yes, this is generally what can be done. Disadvantages include:

• having to buy yet another device
• knowing which dehumidifier will start working as soon as it gets electricity. The ones sold in my country are all no name brands with little information if they will work or not and few spec sheets.

The only smart thing I'd want an oven to do would be to turn itself off. That's it, really. Did I leave the oven on after I left the house? Easy fix. Otherwise everything else is pretty much useless.

My stove won't preheat, I guess because it's a safety issue. Apparently you can set a remote start capability ahead of time that gets reset if you open the over door. But I've never tried it, since that seems like a lot.

I can see value in HVAC IoT. Away from home and there's a cold spell? Turn up the heating so your pipes don't freeze, but also run it higher when electricity is cheaper (if you have variable pricing).

I don't think I'd want my microwave, washing machine, or toilet to have IoT features though.

Some 90's microwaves actually used some chips to measure humidity and using a little reference table adjust how long certain foods need to cook for, for instance, popcorn can be popped perfectly without burning and almost without leftover kernels if you can measure how much water is being released. The same goes for cooking frozen meats, vegetables, and so on.

But what we get in modern ones instead are horrendous touchscreens, simple timers that never quite match the food they promise to work on, and Wi-Fi.

a full blown computer, depending on how one defines the term, is so cheap that they are available in disposable pregnancy tests. This shouldn't be a thing because of the E waste and inefficiency but it's how things are.

Yeah, I wish I did but alas not

They just said the smart timers/meters don't work. Maybe a non internet one with some regular timers. I have grow lights that have 12, 6, or 3 hour timers that repeat the start time daily as long as a power outage doesn't reset them.

Lower tech solution that would probably work for them, but someone would still have to make it. Not sure if they exist but wouldn't be surprised if they do.

I can do that but I don't wanna - Bart Simpson

That's why projects like this are great: https://github.com/Hypfer/esp8266-midea-dehumidifier

My Midea Cube dehumidifier can never be bricked and will never send data outside of my home. It talks to Home Assistant via MQTT and nothing else.