What the hell is even your problem then? If you're saying the author could've just used any diacritics and explained them from context, which they already did in their own way, then are you saying that you would've been fine with the squiggly lines being over different syllables instead of next to them? That's not always even possible when writing with Kanji where one character represents multiple syllables. So yeah, if your idea is so much better, please give us a real example of what the author should've done, instead of just saying "my idea is better and totally possible."