... I, without suffering from tongue-tied, confusion of thoughts and (hopefully) - schizophrenia, always put an ellipsis at the beginning and at the end of a sentence ... Always !!! ... Why? ... I don't know, it's higher than me ...))) ... Even when I went online, using a push-button phone and talked on forums in the 2000s, where the amount of characters in one message was limited, I still put it ... Perhaps this is a latent desire, like something to stand out, perhaps the desire to display the thought process, and perhaps both, even more so, both factors have a place to be ...)
This all speaks of understatement, or rather, under-formulation. A person explains the topic to himself in a very mushy way, but to a friend so even more so.
Or the person simply hints that you might have guessed it yourself))
I have two friends in social networks constantly put three dots at the end of their statements. After a long conversation (5 years with each), I finally dined that they are schizophrenics and even sociopaths who have neither friends nor normal wives. Others have normal sentences and statements with and without dots, and even if they are also schizophrenics, they did not give a reason in business and communication with me.
If you are sure that the ellipsis is superfluous and is not justified by real necessity, then it may be that the person does not speak the language very well (regardless of age) and feels it himself. He wrote as much as he could, but the lyrics were not nearly as impressive as expected. And he puts an ellipsis as a sign that “I wanted to say a lot, there was a deep thought, you don’t think, but it’s like ... (and think out for yourself“ how ”, I’m too lazy to work on meaningfulness).”
This, it seems to me, happens because in living speech such a person uses facial expressions, intonation and gestures more, not being able to fully express a thought in words. It will be impossible to understand the protocol of a conversation with such people, everything there is based on non-verbal. Excessive emoticons are sometimes from the same place.
the fact is that schizophrenic patients do sometimes have confusion and incoherence of thoughts, but in writing - each case, I think, is individual
the patient may have time to sit and think about the sentence and its meaning, so it is reckless to diagnose mental illness by writing in general cases
In my opinion, the frequent ellipsis itself can mean a lot of things. First, a person is trying to convey the intonation of thinking (you need to buy a cake ... or beer ... or still a cake ...) Second, the person is lazy or he cannot write a coherent text. Third, it seems intuitively that ellipsis is more "romantic" than other punctuation marks.
Something else has been written on the Internet about schizophrenic ellipsis, but not a single link to any decent source (book or article) I could not find. And in the decent I know nothing about it. That is, in schizophrenia, there may be an inability to build a coherent text, which, probably, can also be expressed by dots in the letter, but it is better to ask a psychiatrist about this.