I recently asked this question Why Newton wanted lines to be generated by continued motion of points rather than by apposition of parts? in MSE. I did get response on the day of my submission of question, but I was not satisfied. So, I thought of posting the same in PSE, as I thought it would also be on topic there also. While I was discussing there, someone said me that, the question best suits to HSM, so I posted the same question there also.
Arthur Fischer commented:
Don't cross-post the same questions to multiple sites.
Is it not allowed to cross-post when it is on-topic everywhere? If it is not allowed, I don't understand why, each group, whether mathematicians, physicists, historians, or any other group will have different things to say about the same question, then I don't think it to be a bad idea to cross-post. I felt bad from Fischer's response :(
I don't understand whether the question was not on-topic in MSE, as it was migrated to HSM. I wanted to discuss little more, particularly in MSE, which I can't do now, as it is migrated.
The purpose of me wasting my time here is, I don't want the same thing to happen for other questions, which will get different anwers/views from different sites.