I know that the thesis is needed when doing their master. But do people still need to write a thesis when doing research as a past-time?
What if they just want to publish an article but not thesis?
I know that the thesis is needed when doing their master. But do people still need to write a thesis when doing research as a past-time?
What if they just want to publish an article but not thesis?
No, people don't have to write theses after the Masters/PhD. The thesis is a formal requirement for those degrees, but after that, it's just not necessary anymore.
Actual research papers, though ... those are effectively "compulsory".
I am not sure in which academic system the other answerer works, but yes, theses are actually required after the PhD sometimes. A categorical answer like this makes little sense and would probably benefit from a broadened point of view. For example, the habilitation, which one obtains after the PhD, requires a thesis in many countries (Germany, France...).
However they are not required to publish articles. Even students who have never written a thesis can publish articles, if their research is good enough.