I don’t want by any means “fire shots” nor deny anyone their (desired) features. This is a open discussion and nothing else.
Regarding your first point I have to disagree. Mudita clearly states while there is the possibility to sideload apps it is not officially supported. Sideloading is on the users own risk.
In regards to your second point thanks for the general clarification. While I see the point you’re making this also affects mainly using sideloaded APKs, doesn’t it? The stock apps and the OS itself are AFAIK well optimized for the display mode in use.
I don’t have knowledge about different e-ink modes even though I have an e-ink ebook reader (which doesn’t support different modes other than a dark/bright mode). Maybe you can elaborate on those modes? Otherwise don’t worry since I’m familiar with using a search engine 