@neyet
Are you planning on selling the books you made or just for personal use?
Why? Because your device perspective is skewed.
Go look at the devices listed by MR members under their name
I have a small number (compared to others). Not ONE is a phone. The screen is too small. My Tablet is used for when I need color or a PDF.
OTOH
My reading is Novels, so I don't need EPUB3 or KFX compatibility on my reader.
K.I.S.S. There needs to be a pressing reason to us bleeding edge formatting on a general use item.
The stuff that is PDF, I usually want to see it all (at a reasonable size) at once, with the ability to zoom once I identify the area if need (in diagrams)
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