It's exciting to see progress, but I think 180 days is too short for this to be worthwhile for people who really wanted this. They've leaned heavily into the "nomad" part, but the issue is more of practicality. This visa doesn't come with a Residency Card, which means that getting a traditional lease in Japan is going to be difficult. For 6 months, you'll be on an uphill battle with some services like housing, which can be important. It's just long enough that you won't want to maintain a home in your home country unless it's paid for, and short enough that it makes moving your possessions impractical. You also can't renew it, and you have to be out of the country for 6 months before you can get it again.
I think this would be very appealing if it was a 1 year visa at minimum, but comparable visas (e.g., the Taiwan Gold Card) are up to 3 years. I'm not terribly upset at the lack of Individual Number or Residence Card, but the length is definitely something that makes it unappealing except in the most nomad-of-nomad situations.
Apparently they'll be opening it for public comments in the second half of February. They said that they based the 6 month time period on questions they asked foreigners about how long they would want to stay -- so maybe this is the time to push for a longer period of time.