by splitting your resources across many projects, you run the risk of all of them not reaching a critical threshold for which they experience exponential growth.
I think some people at any given point in time (and some institutions and some governments) do a better job than others at splitting their resources because in part because they have a better framework at recognizing what may reach that critical threshold faster than others based on a given set of conditions (or have lower switching costs when it comes to deciding to not allocate resources to something after a certain point).
It doesn't last forever, but nothing does! Instead there's an exciting idea in place: instead of committing your entire life to trying and getting "one thing" to be as big as possible, you can kickstart many things! As someone who likes a bit of variety in my life, that sounds way more exciting to me.