> Just different definitions of "work".

I'm going to disagree on this simplification. There is a common definition of work, e.g. the definition used in the context of work/life balance (i.e. the context of the original article), that is widely used; redefining it to be as broad as you've described is detrimental to the conversation.

> Something that requires focused effort, and done for some tangible purpose.

Essentially everything can be made to fit this definition, making it, I think, not very useful.