I am a PhD student works in theoretical computer science(Algebra). I have been working on my PhD project from last five years. I am very much interested in my work. During my Ph.D there were not collaborator were there other than my research supervisor. I struggle a lot during my Ph.D as problem finding was very tough, solving also and then writing. I even did not find the course work which I did any helpful. I was also not allowed to work outside my university I don't know why. Now at the end of my Ph.D I come to know the value of collaboration.
I have studied most of things in Ph.D. at my own. I come up with results and written those with the help of research supervisor. I have worked very hard in my Ph.D. despite of that I am not publish a single paper in top tier. All of my research paper are in low tier. I will be graduating soon.
According to my research supervisor, PhD is to train a student not to publish something in top tier. This is true for all of his Ph.D students that they publish in low tier.
I am worried about post-doc and Job after my Ph.D as many of the students in my field are publishing at top tiers. I can publish research paper at my own but not in top tier.
Question : Is it okay to publish your entire work of PhD in low tier?