Tfw you *have* to tell the client it's *technically* possible, but at the cost of work and complexity... and they come back with "let's simplify the whole thing then" *.*

We had one client. They asked for a table where they can edit everything, sort, filter, use custom formulas and collaborate with others.
Basically, they asked for Excel online, but with out data.
You should’ve seen their faces (It was about 4 years ago) when I answered : Only 3 company in the world did it : Apple, Google and Microsoft. We can (probably) do it too, but it’s going to cost you more than a million USD.