why the helium team doesn't announce the exact date of launch ?
Security and quality. They don't want to commit to a date until it's ready. I imagine they aren't just releasing a Dash clone but making changes in advance. He may be implementing service node code for all I know. He has been working on service nodes for a while, he may have a beta version ready to deploy.
He also said that the blockchain is vulnerable until it is stable, it can be forked in an attack. So he doesn't want people targeting the blockchain before it's public.
I am glad they are taking precautions to prevent issues but at the same time excited to get this coin born.
For those that don't know, try using Xios or Burstcoin. Birstcoin was fractured into 6 blockchains and now Xios has forking problems. Most users have no idea to go to Discord and download a file to ban bad nodes to get them off a fork. A badly written code will destroy a coin, not just damage it.