correct. Some fan translations miss out on important parts of a sentence or something of that sort, official translations are more reliable.
There are some scanlations that do a really good job translating from the original language to English, but unfortunately there are some that really do a crappy job at translating and they know it. They don't even bother to clean the raws. I mean, I guess you could say that they do it for our benefit, but I personally, don't like those translations and prefer to wait. Of course, if you prefer those translations because you just can't wait to know what's happening next, you won't mind reading those. It's a matter of personal preferences.
There are some good translation group but lot of them basically translate it from translating apps which doesn't make sense for lot of parts.
Genuine question, why do we need official translations is that because they are more correctly translated ? Please explain