Yes, you're perfectly right, but maybe you see it more from the developer's side and I from the customer's.
If, in some future, I would buy an new epub-device and would wish to continue using my Pocketbook dictionaries then I am restricted to one brand, Pocketbook.
And if, in some future, I would buy a new mobi-device and would wish to continue using my mobipocket dictionaries then I am in the same way restricted to one brand, Kindle (as Bookeen isn't developing any mobipocket firmware anymore).
So, it is really great and a very big advantage of the mobi format to have a dictionary specification but if you have only one brand of devices that can make use of it, the advantage leverages a little bit.
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