If after doing PhD, a research scholar has 4 to 5 papers published, and all are published in the same journal (SCIE), then what impact does it have on his future teaching, academic career, or post-doc?
I think it is not a good idea to publish so many PhD thesis related research papers in one journal; it is better if the papers are published in different journals. If you decide to publish all papers in one journal, then you should select a high impact journal, and it is not easily possible. Top high impacts journals have very strict rules and high standards to select papers for publication. However, the importance of the research papers to fill the research gaps bring worth and appreciation.