By whose authority?
In all seriousness, it's interesting to see how the live language is diverging from the rules. The dual ending "-ayim" is supposed to be used with the singular stem: nekuda(-t) - giving nekudatayim "two dots", and likewise shnatayim "two years", dakatayim "two minutes", etc. But in practice, speakers classify dual as plural and use the form with both plural and dual endings: nekudotayim, dakotayim
There are not an unlimited number of acceptable methods for romanizing Hebrew.
take the Israel city of Petach Tikvah. Assuming you know about the gutural h in hebrew, you know how to pronounce it correctly via that spelling. However, that's not the official transliteration. The official one is Petah Tiqwa. And unless you know that the w should be pronounced like a v, most israelis (perhaps not those of yemenite extraction) will look at you strangely.
why transliterated weirdly? my understanding is that its meant to be able to go 1:1 programmatically back and forth between hebrew and english, so you end up with things that look weird to the english trained eye.