Why are there almost no words in English containing the letter combination “zh”, despite the fact that that the sound is quite common, e.g. “measure”?

Question

Why are there almost no words in English containing the letter combination “zh”, despite the fact that that the sound is quite common, e.g. “measure”?

In: 2657

Answer 1

Eli5: why does English constantly break its own rules and make spelling unnecessarily confusing? 😩

As somebody who’s studying to be an elementary school teacher: I dread having to answer these types of questions.