In this forum, and in this question I noticed, in general, that changing advisors are regarded as something that is bad and very difficult to achieve? Why members with high reputation on this forum, spread such a false information? or is that usual in academia, so the cases that actually change advisors are the exception from a majority of the situations in PhD programs. I see people dont understand this question. User with high reputation points on this forum, claim that you should drop or change PhD program, instead of changing advisors. they dont provide any source or proof to support their claims. Whenver this problem is brought, they tend to vote for closing question or delate comments.
We say it because in the overwhelming majority of cases/countries it's true. If Glassdoor ever start including reviews of academic supervisors, you will see some really scary stuff. The longer you stay in academia, the more you see. That is why we try to warn people.