I've never had issues with dishwsher detergent except for over foaming of Fairy (like Cascade) Pods and some detergents doing a poor job of removing tomato from plastic. Neither issue is anything to do with pods, just formulation.
Not sure that you really need a pre rinse with detergent. The key thing is the prewash is high pressure enough to clear as much debris off as possible. Most decent dishwashers can do that without any issues. The higher end machines genuinely have more powerful pumps, abilities to do variable speed drive and have better designs of jets and filters.
The filters on European type machines don’t need very regular cleaning unless you’re putting in huge volumes of food scrapings, which shouldn’t be going into any dishwasher. Those machines use a self cleaning filter with water drawn through multiple layers of mesh horizontally during the wash and the drain pump is connected to the bottom of the filter drawing water vertically, which will suck anything through that’s small enough to pass through the drain pump, which would include things like peas, rice, chopped food etc etc.
They also don’t pump ground food back into the wash water, which the grinder versions do.
I look into the filter on the Miele machine I have at the moment and it’s fairly rare to find much inside it. It really isn’t very frequent maintenue issue and I only very roughly scrape plates. I absolutely never pre rinse things.
How does that design of dishwasher he demonstrated heat the water, given the element isn’t immersed?
Older dishwashers here had an exposed element too, but they are usually immersed in the water during the cycle. Most modern machines have in-line heaters on the output from the pump that aren’t visible.
It also means there’s no issue with excessive heat in the drying cycle at the bottom rack or fire risks should some plastic item land on the element.