Samsung front loader washing machine here.
It is generally musical while selecting program options. It sings a little song when finished, which is only after it unlocks the door. The little song only plays once. The little song can be changed to other tunes by subtle and undocumented button presses.
After about 10 minutes it plays a few notes while turning itself off that are easily recognisable as the notes it plays when it turns itself off, so if you miss the first little song, once you hear that you know it’s definitely finished. After that it is done. No more door locking shenanigans or tumbling or clothes.
Generally I use the “sportswear” cycle which is about 1 hour, my clothes are generally not that dirty. Sometimes I treat towels / linen to a hot cotton cycle which is 2.5 hours and a 90 degree (Celsius) wash.
Had it for 10 years now, no mechanical or electrical issues. I always leave the door ajar when finished and once every few months I do a cleaning cycle.
I also have a Fisher and Paykel dryer. I have owned it for 8 years, in which time it has needed a replacement drive belt as it gets used heavily. The bushes on the drum need replacing soon, but I just turned it upside down so it will last for a while longer
Regarding your door issues, well that’s because idiots try and open the door during a load, and then when it’s locked, they turn it off and still try and open the door. They subsequently complain about the water going everywhere. Don’t forget that manufacturers have to deal with the lowest common denominator end user.
It was a Sharp “Memory LCD”.
https://sharpdevices.com/memory-lcd/
Basically “visible memory storage”.
You treat it as addressable memory and write into it, and it will hold that state using about 15 microwatts to do so.
You can still buy the display modules , there’s a few boards that let you easily drive them with arduinos and etc.