Trump is a FOOL to continue with his 'tweets' given all the grief he has brought on himself with them. But, like any addiction, he seems unable to control himself.
I have no way of knowing if this is true, but I suspect his constant 'tweeting' is a factor in why his communications people quit. How can anyone be a good communications official, or a good PR professional, if the client insists on doing all of his communication and PR on his own? And Trump 'communicates' without any kind of oversight of any kind including legal advice, public relations advice, and even simple editing. This worked for him when he was a simple candidate who nobody thought would actually win. But now, everything Trump writes is a reflection of the United States as a nation. Things are different now and Trump does not seem to recognize this. He does not understand the power his words have all around the world. Working on Trump's communications staff would be frustrating to say the least.