Just like with the consonant-<le> pattern, there are common overarching patterns in which words take double consonants and which ones have single medial consonants.
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"An orthography will use whatever tools it has at its disposal to represent its language."
The more complex explanation requires an understanding of allophones and phonemes.
In spite of overwhelming scientific evidence, OG and its Phombies continue to teach the schwa – [ə] – and "short u" – [ʌ] – as the same thing, and they're not.