Earlier quoted context omitted.
Pronunciation drifts in all languages. But usually languages take some effort to have either a clear mapping from spelling to pronunciation (when you read it you can pronounce it) or from pronunciation to spelling (when you can pronounce it you can spell it); or some compromise that tries to achieve both. Hence when pronunciation drifts too far that eventually causes the word to be spelt differently too. Meanwhile En…
How does mapping spelling to sound work in languages like English that have homophones? "wear", "where", "were-" (as in werewolf), "weir" (in some regional dialects) can all be pronounced identically in modern English. If we map them all to a single spelling, is that an improvement to readability and understanding?
If you "cleaned up" English spelling, the same would happen with wear, where and were-. If the distinction were important for understanding, it would be equally important in spoken language and the pronunciations wouldn't have converged.