Q: the pronunciation guide on M-W is given at the bottom of every definition page 'E as ea in easy'. That's a secondary pronunciation, and if you click the loudspeaker, the sound version is with the short e.
Ghol I think your theory about having sufficient letters to not flub the pronunciation makes sense and is correct. In fact, had I thought a little longer before posting, I should've realized it because I've occasionally become irritated myself when having to 'backtrack' across a line boundary to recover the correct pronunciation due to a poorly divided word.
I think it's perhaps worthwhile to recall one thing here: the issue of syllabification is something that is not part of natural language, that is, unlike phonetics, semantics, and syntax, all of which go back thousands of years to the dawn of human language, syllabification is a late artifact added after writing alphabetic languages in end-justified columns was invented (I have no idea when that was). And even then, in the early days I think they stuck hyphens pretty much anywhere.
So I tend to think of syllabification as part of epigraphy or printing (like fonts) and not really part of language. It's not something we worry about when we speak, listen, or even read unjustified text. I suppose that there's also a phonetic component to it as far as which collocations are possible and where stress can fall.
Not surprisingly, there's even a theory of it, e.g.
http://www.unc.edu/~jlsmith/ling60/syllable.html though I looked carefully at this page.