1. Native English apparently does have some few examples of use of diacritics eg Bronte (w the diaeresis) although i suggest it is possibly originally a 'foreign' name? But virtually every one in current use is a 'borrowed' word.

2. but! my firm belief is that English SHOULD use/deploy diacritics more often to indicate pronunciation when that is ambiguious, or, more especially, where there are two or more English words spelt the same but with a different pronunciation (and obviously meaning).

I only give one example, but it is a very clear and definitive example - 'close' and 'close'.

But i can find nowhere that advocates for this reasonable, logical, and helpful, idea.

the 'respective' is redundant in 'its respective area'.

i would add a comma after 'area'; but i am not sure about 'serves' or 'serve'. hmm, i guess 'serves' to match the tense of 'handles' (but could be 'handle' and 'serve').