If you fail based on any of the "would be nice to know" items, you were never going to succeed.
Find another few founders, ask them what they use. Find another few who use the same, ask what they think. Repeat.
If you can't figure out how to hire, you're not fit for this.
There's really nothing to any of this that should be at all difficult relative to product/market fit, and the answers to all those other things change too often to be worth enshrining. "Ask other cofounders" is the trivial and 99% correct answer, so why complain that someone hasn't done that for you given that the data will be stale every 6 months?
Find another few founders, ask them what they use. Find another few who use the same, ask what they think. Repeat.
If you can't figure out how to hire, you're not fit for this.
There's really nothing to any of this that should be at all difficult relative to product/market fit, and the answers to all those other things change too often to be worth enshrining. "Ask other cofounders" is the trivial and 99% correct answer, so why complain that someone hasn't done that for you given that the data will be stale every 6 months?