What is a strategic way to develop messaging for a launch and then continuously update it to align with market feedback? How much data do we need before we update messaging?

I always try to keep in mind that is very inexpensive to tweak your story or messaging. It's a whole lot more expensive to change a product or sales motion. So if you're getting new data you trust, change the story! Try something new, see what happens. Don't be so attached to your messaging you can't throw something out and make some changes. Just do it fast. I've seen a lot of messaging changes get over thunk in bad meetings with too many people involved.

HOWEVER, you want to tweak, not re-write. When you get new good data tweak the story. Tweak the webinar, tweak the keynote, tweak the value prop, don't start over. You want to have a consistent central story. If you are always starting over you're wasting a ton of time and effort you could be spent educating the market.