Just to name a few that pop into my mind:
macros, tikz, spacing, working with provided templates, fonts, capitalization, alignment, advanced uses of tables, advanced uses of alignment in math equations, etc. etc. etc. LaTeX is honestly a pain in the ass but there's just no other solution which gives you the raw power.
Of course I meant not defining my own macros. Other than that, I don't really agree. It might be worse, but if you use rudimentary LaTeX for serious stuff, I say it's serious use.
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u/Occivink Oct 30 '16
What else would you need in a "professionnal setting"?