The problem is that different users have diffeent angles and needs. The question of which apps would be more useful with the choice of soecial accents, characters, etc, is a valid one, but doesn't take into account that many users already have easy access to those characters due their keyboard layouts and end up with a duplication of features.
So, if one types frequently in foreign languages, that person would be better served using a keyboard layout that addrrsses that need in a better form, such as US International - PC layout. However, if one uses special characters rarely, why forcing them to use a new feature taking away another one (normal key repeating) that they, the users, have used and taken for granted for so many years.
There should be a keystroke to enable choosing a special character - the feature itself is vey clever. Bt taking away the ability to repeat keys is definitely very intrusive of Apple.