At least nowadays many places bother to train TAs. My understanding is that not too long ago, the TA was just handed a syllabus and told to teach a class. Some schools had a reputation for admitting excess graduate students just to serve as TAs for a bit before being shown the door.
However, there are some universities that focus on quality undergraduate education. In those places, teaching ability is a big part of the hiring process and people have been denied tenure over poor teaching. It’s the big research universities that have historically been lax in their teaching standards.
In the US academia it is definitely true. Especially teaching undergrads which is often enough just relegated to TAs.
At least nowadays many places bother to train TAs. My understanding is that not too long ago, the TA was just handed a syllabus and told to teach a class. Some schools had a reputation for admitting excess graduate students just to serve as TAs for a bit before being shown the door.
However, there are some universities that focus on quality undergraduate education. In those places, teaching ability is a big part of the hiring process and people have been denied tenure over poor teaching. It’s the big research universities that have historically been lax in their teaching standards.