There are many reasons to learn how to divide xrefs into syllables. Separating a word like xrefs into syllables is mainly to make it easier to read and pronounce. The syllable is the smallest sound unit in a word, and the separation of the xrefs into syllables allows speakers to better segment and emphasize each sound unit.
Knowing how to separate xrefs into syllables can be especially useful for those learning to read and write, because it helps them understand and pronounce xrefs more accurately. Furthermore, separating xrefs into syllables can also be useful in teaching grammar and spelling, as it allows students to more easily understand and apply the rules of accentuation and syllable division.
In the case of the word xrefs, we find that when separating into syllables the resulting number of syllables is 1. With this in mind, it's much easier to learn how to pronounce xrefs, as we can focus on perfecting the syllabic pronunciation before trying to pronounce xrefs in full or within a sentence. Likewise, this breakdown of xrefs into syllables makes it easier for us to remember how to write it.