Thanks for the reply. I think the advantage would be that this would be a way to build a relationship with investors before you're ready to raise money, while AngelList seems to focus on connecting entrepreneurs and investors once they are already raising money. It also would provide a venue for investors to broadcast the needs of their current portfolio, which AL doesn't seem to do.
Time spent does not always equal output. Some of the best startup founders in the world can do more in a day than another startup founder can do in a week. It's all about what they produce, not how they produce it.
If your partner meets or exceeds your goals of what should be created, then you shouldn't worry. However, if he is truly slowing things down, then that's a problem that needs to be explored further.