Most of the times official translations are more accurate and make more sense than the other translations (no offense to the translators; it's just my opinion).
And sometimes official releases come uncensored as well (at least BL titles).
for future readers and more accurate translations, mostly. personally, i don’t mind them and would even reread the officials to see what might have changed. a single word/sentence can change the meaning of an entire scene sometimes haha (some upload it for uncensored/mature versions too)
the officials usually are higher quality and have better translation
Fan translations are not officials, they’re more like fan translators doing a favor for other readers, whereas officials come from the official websites/platforms so they give you almost exactly what the author wants to say. Personally i enjoy both, but sometimes don’t like officials when they ruin the vibe of some stories (like Paws & Claws using term “Boy” rather than “Pup/Puppers/Pupy”)
Can someone tell the reason for the official translation when it’s already been translated, it pisses me off when I think a chapters been uploaded but it’s just the official translation.