I have noticed that ever since Joe Biden took office, he has tweeted from @POTUS. However Donald Trump, for example, tweeted primarily from his personal account, which is suspended. When @JoeBiden tweets, it is solely retweets, mostly of @POTUS content. Kamala Harris seems to have made a similar move as well.

Is there any official or plausible reasoning for Joe Biden not tweeting directly from his personal account?