To my surprise certain subfields of CS don't use LaTeX at all or rarely and use MS-Word instead. You kind of have no choice since the conference/journal templates are only provided in one format (well you can create your own template but only if they accept PDF entries...yes some only accept Word files).

I agree with you here, and have no idea what the OP is talking about. In Math and ML, TeX is so ingrained in the culture that there are _jokes_ based on TeX puns. (Where do mathematicians go for a rational rack of ribs? The \mathbb Q)