No not all languages are one to one but as someone who has learned 3 extra languages, English is different. Though, thorough, through, trough, tough, bough. English is sometimes a form of hieroglyphics because we learn words by how it looks as a picture rather than letter by letter. Once you know generally how words are pronounced in other languages it is quite easy but not English.

English has a conservative orthography. But so do a lot of languages. That's not the area you should be looking for uniqueness, anyway.

As the English language changed over time, we didn't change spelling.

We did, but maybe not as much as you'd like. Anyway as for not changing , same goes for French. Same with a lot of languages. Very recent spelling reforms are quite few in number.

I know other languages have connotations too but it's different for every word. You couldn't say "home sweet home" in French. They don't have those connotations.

Yeah but French has a bunch of different connotations English doesn't. "The little death" makes no sense in English. That's just language. All languages do that.

Arabic also uses the dipthong but its one of the only.

What do you mean by this? Diphthongs are hugely common.

Arabic is also perfectly phonetic.

That doesn't mean what you think it means. You're just talking about writing systems here. You can't say the Arabic language is completely phonetic and others aren't. That's a nonsensical statement.

And anyway the Arabic script is certainly not a 1:1 correspondence between letters and sounds.