This seems like a problem that could be solved by standardizing the parts among multiple models (possibly between different brands), so if legally mandating availability of replacement parts encourages that, it might not be a bad thing.
Let them sell us autonomous cars for $1,000 which need a $5,000 subscribtion to drive. Oh, you want to put child i a car, the car won't start unless you add a child add-on.
Oh, you need to go to the hospital, because your wife is giving birth, that will be extra $5,000 one-time fee.
If you want your own part, you have to either make it available, or you have to make it reliable enough that you don't need to.
That would remind the incentive to have parts that fail be profitable. Making unreliable and unserviceable devices should cost you more.
Not terribly surprising but I didn't expect everything to be exactly the same across that many know and unknown brands
This can be an advantage as sometimes you can flash default firmware to turn a cheap yumcha monitor into a better one.
Of course the sheet metal frame, motor, and controls are the same but on a dumb appliance those rarely fail. on a "Smart" appliance those the replacement "smart" controls can be more costly than the entire replacement unit