There is clearly no such thing as THE ideal size. It depends where you are reading, and what you are reading.
Reading technical PDFs or magazines requires a large screen. Novels can confortably be read on a small screen. Small devices are great for portability; large-screen devices allow you to see more at a time.
It is, therefore, a meaningless question to ask what THE ideal size is. That implies that there is one size which is ideal for everything. That is clearly not the case. That's why one requires multiple reading devices.
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