I had a 5" Kobo Mini for a while and except for the lack of a front light I thought it was just fine for reading. Personal preference is one thing but I don't think it makes a lot of sense to say that 5" is too small. You might want a larger screen but that's not the same thing.
I do most of my reading on a 6" Kindle and a 5" phone these days. Probably 60% on the Kindle and 40% on the phone most of the time, although with my current book I'm experimenting by trying to read the entire 500 pages on my phone. That's going pretty well although the LCD prevents me from having very long reading sessions.
Till last year I had a 4.5" phone and I really liked that better for reading. It seemed just the right size, although 5" is good enough.
Think about newspaper columns. They're narrow because early studies showed that people read faster and easier on narrow columns. Newer studies sometimes disagree and I don't think anyone is very sure of any of that anymore, but people do read newspapers happily and reading on a phone or a 5" ereader gives even more line width than a newspaper column.
Barry
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