Because there are vast range of experiences beyond the world of work which can fill and enrich a human life. To be not engaged in the rest of the world is to live a half life. No one died regretting time no spent at work or money unmade
Here's one example of a situation where I could very easily see someone regretting not spending more time at work.
As a professional creative, I'm betting there are a fair number of authors, film directors, screenwriters and so on who died regretting they didn't finish their latest work, or didn't spend more time on the thing they really wanted to make. That's work.
