Market. The main market focus was on the US and now Europe. Most languages uses left-to-right, so that is their main focus.
There are some threads about it around the forum. On some readers you can load alternative firmware which solve the problem.
I am not sure that the latest version of ADE still does not support it. Even if it does, the e-reader manufacturers must create a firmware update to put it on the reader. Not all reader manufacturers are willing to do that.
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