Like English spelling has any rules. There are a lot of irregularities with English spelling that students need to learn by heart how the word is spelled compared to how it is pronounced.
Irregularities don't mean it doesn't have rules. The most common 1-2k words are much less regular than the rest of the language, but learning how they're spelt is not remotely difficult for children (no adult that doesn't have a learning disability struggles to remember how to spell 'much' or 'about'). The rest of the language is pretty much regular.