Did Xbox NEED These Studios?

XBOX just let go of four major studios under their organization: Undead Labs, Double Fine, Ninja Theory and Compulsion Games - and Arkane studios looks to be on Microsofts chopping block as well. With CEO Asha Sharma cleaning house, it's easy to dismiss these releases as huge missteps, but when looking at the track record we felt the need to ask - did Microsoft need to hold onto these developers in the first place?