While there's nothing wrong with a game being declared complete and stopping updates, the way this went down doesn't sit right. Evil Empire (the studio that split off from Motion Twin specifically to maintain Dead Cells) had longer-term plans and the resources to make them happen, but Motion Twin then ordered Evil Empire to stop development because they thought an actively developed Dead Cells would be a competitor to Windblown that they could preemptively kill off.
I get what you mean, but Dead Cells was already a completed roguelike on launch. The DLC's add variety and additional story, but you can still get the full gameplay experience with just the base game.
It's like saying you won't support the Elden Ring because it has DLC.
Also, the Castlevania DLC is just fucking cool. The soundtrack for those levels alone are just -chef's kiss-, and probably the closest we'll get to a new 2D Castlevania 🥲