I don't remember either of them saying that was the reason they wanted their own IP, and I don't believe even slightly that that was their main motivation.
The reason they wanted to be bought by a publisher was for financial stability. They wanted to be able to keep all of their employees employed and not have to worry about needing to lay people off (again) because a project got cancelled.
In your later paragraphs you appear to be directing blame Obsidian's way for the current store situation of The Outer Worlds. This is misguided; this was 100% a Private Division decision.