People forget that Boeing space was an excellent engineering company at one point.
One of the things that fucked it up was decades of cost-plus government work.
Companies become the most profitable versions of themselves the market allows them to be... which without competition usually doesn't bode well for excellence.
Which honestly should happen to some extent (I'm not a fan of SLS). But we shouldn't become beholden to one vendor, and it's sure looking a lot more like removing options for the future and competition than a play for efficiency.
And anyone doing this for their own companies in the past would be a textbook example of corruption.