Yup, I know what you mean.
At least with the likes of Fallout and its DLC like Nuka-world or Far Harbour you could access anytime, switching between base game and DLC. This Outer Worlds DLC looks like it was a half-assed attempt at squeezing a bit more cash out of the game - Truly stunning that Obsidian think this approach is acceptable.
Easy solution - I won't be buying any more DLC's (well done Obsidian awesome Business strategy )