[slantyyz]

Sadly, I don't think dishwashers will last 20 years any more. Since 2005, I'm on my third dishwasher. The first one lasted 9 years, the second one around 5 (with one under warranty repair).

At some point the repairs/parts cost more than what the original dishwasher is worth.

Regarding the algorithm, I'm not sure they make a huge difference anyways. FWIW, The Technology Connections channel on YouTube has a couple of pretty interesting videos on how dishwashers work and how to get the most out of them:

https://www.youtube.com/watch?v=_rBO8neWw04

https://www.youtube.com/watch?v=Ll6-eGDpimU

[OtomotO]

Money isn't of real relevance to me, so if it costs more I don't really care unless it's a ridiculous difference