However, from my experience in the past, I actually tried that on a number of BIG projects - knowing only a couple of things:
1. The ideas were big - thinking about 50k LOC at minimum.
2. I had too much ego to let them go
Bad, bad mistake. Bad rs.
I scaled back to just working on 1 big project, and maybe toying with 2-3 smaller projects, and it has worked out better.
But the essence of your advice is right - work on a number of projects, and focus on one that works.