Thanks @junrushao for your reply!
To be frank, for now, for a high-level use of TVM I agree that it’s not necessary to build these IRs by hand. I did this because I found you were promoting TensorIR which makes TIR self-contained. I am interested in this and I think in the future TIR itself would be used more frequently, so I started playing with its APIs (and hybrid scripts) to understand it better 
.