I wouldn't say it's impossible to read on my 4S, but it is certainly not "optimal", due to the table-based layout (with large margins). The page is zoomed out quite far when first loaded. Text is rendered pretty small, even when you double-tap to zoom in on the content "column". It's readable for me, but I still have pretty reasonable eye-sight. I can imagine it would be a lot harder if your eyes were even just slightly less capable than mine.
As for the original question "why?" - my guess is because a) it works, and b) it's quick. Sometimes you need to be pragmatic about these things.
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I wouldn't say it's impossible to read on my 4S, but it is certainly not "optimal", due to the table-based layout (with large margins). The page is zoomed out quite far when first loaded. Text is rendered pretty small, even when you double-tap to zoom in on the content "column". It's readable for me, but I still have pretty reasonable eye-sight. I can imagine it would be a lot harder if your eyes were even just slightly less capable than mine.
As for the original question "why?" - my guess is because a) it works, and b) it's quick. Sometimes you need to be pragmatic about these things.