Well yes, if you are talking about "word processing" which is a misnormer anyways and most of times a horrible overkill... I rarely use anything else than emacs & vi as my word processing tools and they do nicely for me, thank you. But there are some tools that really are the killer application in office suites, be thy libre or legacy, and that's spreadsheets. be it calc, exel, lotus, whatever, but that's the killer application on office tools. I couldn't go far without a sheet to type my numbers in