Spelling difficulties are are artefact of what makes English so powerful, though -- its ability to simply adopt foreign words any time it feels the need to do so.

The base language was formed by crashing two major European language families into each other a thousand years ago, and we've been happily borrowing words from every other language on Earth ever since as we've needed them. If we want to make up a brand new word, as we so often do in science, we'll probably reach for a handful of Greek and Latin prefixes and suffices and stick them together any way we like.

After a thousand years of this, English is probably the language with the biggest and most expressive vocabulary of any language in the world.