In a project everything must be prepared.
1. The team is experienced in technology so their concept will be good if it is experienced.
2. Funds must be prepared because building a project must have funds. Do not rely on funds from the sale of ICO / IEO. It will be difficult if the project does not develop.
3. Products must be prioritized because the project has a goal on the product so this step must take precedence.
4. Good marketing and can build a community with many who are interested in the project.
5. Do not underestimate tokens at the entry into the low exchange because it will anger the investors.
There is no most important thing whenever it comes to project development because every facets or stages of the token growth, project advancement etc is very cruicial and important. Your List 1 - 5 are important as well as having excellent marketing in the blockchain space. For me, the most crucial thing that makes a project succeed in the blockchain is when the developers are willing and hardworking.