Lougle
What's the difference between having to learn that one sound can have two spellings vs having to learn that one spelling can have two different sounds??
Both are unhelpful for learning to read and write, but inconsistent use of doubled consonants is one of the very worst parts of English spelling.
I've established that at least 4,000 common words contain one or more irregularly/unpredictably used letters. Among those are 400+ which use doubled consonants helpfully for learning to read, as they are supposed to, e.g. ballad, belly, billy, collar, bully.
But their use is unpredictable, because they are undermined by 500+ words without doubled consonants after their short vowels, such as 'salad, celery, bilious, column, colour'.
They undermine the basic logic of doubling after short vowels (latter, letter, hidden, copper, cutter) and not doubling after long vowels (later, delete, hide, cope, cute).
If we always doubled after short, stressed vowels, and never misused this principle for obscure grammatical reasons (e.g. arrive - cf. arrow, arise), both learning to read and write would become very much easier.