Acquisitions from the acquirer side always tank the stock, the acquired always get a bump. The down market and the $20B spend is why it is down.
From an ADBE perspective, this actually is a good long term move and shouldn't be such a hit.
From Figmas perspective, I am sure this was one of their hopeful outcomes.
If people here don't like the outcome, then I wonder if they know what type of game they support. This is the game with VC/growth/exits.