What do you think about (people arguing against) realtime preview for TeX-like systems? https://tex.stackexchange.com/a/75845/250119 (there's no such comment about that in the duplicate target.)
I think having realtime preview is useful (for example when I do homework I definitely have to look at the output to see what is going on, especially for matrices, the source is hard to read. Or am I supposed to write on paper first then type it back into the computer?)