Difference between てばかりいる and ばかりだ

So one of my teachers gave us some プリント about the uses of ばかり, which is based apparently on the 新完全マスターN3文法 book. I have read her examples and the book’s but I can’t figure out if there is any difference between てばかりいる and ばかりだ. The book says they mean “always do \~ only, do nothing but \~, there is nothing but \~. Often used to express disapproval” and “repeatedly or continuously \~,without doing other things. Usually used in a critical way” respectively, which clears up basically nothing for me. I found this question: [https://japanese.stackexchange.com/questions/65429/plain-form-bakari-vs-te-form-bakari](https://japanese.stackexchange.com/questions/65429/plain-form-bakari-vs-te-form-bakari), but they don’t really explain the meaning of 辞書形 + ばかり with verbs like the one used in the question (泣く). I understand the nuance when verbs of change are used or it means “the only thing left is…”, but not in other cases. I also read this page: [https://maggiesensei.com/2013/07/02/%E3%81%B0%E3%81%8B%E3%82%8A-bakari/](https://maggiesensei.com/2013/07/02/%E3%81%B0%E3%81%8B%E3%82%8A-bakari/) and got the impression that maybe ばかりだ is used for when something is happening repeatedly at a certain moment, but not necessarily always, and てばかりいる is for habits or actions that happen often, but I’m not certain at all.