Side versus Sides

I know my beloved Anniversary is fickle and inconsistent and sometimes drives me crazy.  I'm going to vent:

And I can understand why, if "side" is written S-I, "sides" written as S-I-S can easily be transcribed wrong as "size."  But why have "side" write S-I and yet "sides" as S-I-D-S?  That's so obviously inconsistent.

For the record, I've been writing S-I-S for "sides" all these years, not knowing any better.

:-(

As much as I liked the functional method ("no rules!"), the system can have used a bit of tweaking.

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