When editing Wikipedia, I have repeatedly run into the following issue:
The article contains a link and I want to change the beginning of the link text (not the link's target), usually because it is upper case and I want it lower case. So I use VisualEditor to delete the first letter of the link and replace it with its lower case version. The result is unexpected: the first letter is not marked up as part of the link, but this is very hard to see.
The source code is transformed from [[Link]] to l[[Link|ink]]. Links like the latter are almost never contained in human-created wikitext.
Suggestion: link text should be "magnetic", so that changes at either end will automatically inherit the link markup.