Agreed. As a longterm users of both Excel and Google sheets, for simple tasks G-sheets is enough (and probably better for sharing). But any complex modelling should be done in Excel - it has far superior performance, short-cut keys, and analytical options. Being able to see the calculations easily for non-technical people is also a big advantage over other analytical products like Jupyter notebooks (e.g. Python / r) or SAS. Of course for really big data / stats modelling you need to use SAS/notebooks/stata (not a fan of the last one). Horses for Courses.