I accept the analogy here between Excel and C, but I think the moral is the opposite.
Excel is very likely a good choice for a lot of people doing complicated stuff with it -- in spite of its problems. It's just that some of those people might also want a niche product that replaces it for some particular purpose. Not an entirely new, general purpose tool.
The problem with using a tool with say 5% of the features excel provides is you sooner or later run into some feature you need, but is absent in the niche tool. You can't exactly split your work between two tools now. So it just makes sense to use the tool with the super set of all the features, even if you don't use all those features all the time.
The right comparison for this would be using some thing like awk/sed compared to using Perl.
Excel is very likely a good choice for a lot of people doing complicated stuff with it -- in spite of its problems. It's just that some of those people might also want a niche product that replaces it for some particular purpose. Not an entirely new, general purpose tool.