Originally Posted by JSWolf
To insert soft hyphens is just going to make a mess. Plus, it will blow up the size of the eBooks. There's no reason not to just use the Tex hyphenation routine.
It works less well for other languages than English but even for English you need for each document to specify soft hyphens for a set of words. But requiring a reader to use the TeX algorithm is actually a thing that is in the format. So by adding that requirement you are changing the format (the format also includes things like how the format should be interpreted).