Personal experience of learning a language doesn’t equate to universal experience. A simple google search will give you articles, opinion pieces, and scientific papers discussing the difficult of learning English. Yes, the grammar is somewhat predictable if you come from a European country, but Europe is not the largest population on the planet. English, yes, has a benefit of being widely available media and a plethora of teaching materials, largely because it’s the most logical second language to teach.
English is filled with homophones, holographs, and homonyms that make it extremely difficult for a non-native speaker to reach a high level of proficiency. It’s a melting pot language and so you can’t naturally assume anything.
Definitely read the poem that @zyoeru shared, it’s called The Chaos and it’s the best example of unpredictable spelling in English.