I don't know about culture in German companies, but my experience with end-user products is the opposite of yours.
I used to have a 2005 c-class mercedes, and that was a great car. Everything was well thought-out and had some very nice touches I didn't even know I needed and haven't seen in any other car my dad has had since then. It was very reliable and even had a recall some 3 years ago for a minor issue with the sunroof – which didn't manifest in my specific car.
I also have a Siemens dishwasher that is absolutely great. It has direct buttons on the front for direct selection of the different washing cycles it has, plus delayed start, extra rinse, and half load. It has an app, but you'd never know if you didn't read the manual – everything is accessible through the front panel and intelligible icons. The drawers are adjustable with the latches you need to pull on falling right under your fingers when you hold them.
In contrast, my LG washer + dryer is much more of a PITA to operate, with indicators that don't fall in front of the labels. I have to count the programs and the wheel clicks just to be sure which one is actually selected, even though I've had it for two years now. The thing doesn't even have a dedicated spin cycle! You can only select it as part of some other, larger cycle, or by using the app to upload a "custom" program. But without the app, there's no way of knowing what the currently loaded 'custom' program does until you actually start it.