This is a gross misunderstanding of what vertical integration is.
YKK zippers makes an unbeatable product because of vertical integration.
A lack of vertical integration means that you're subject to the whims of larger markets (and increased interest and costs at every step).
The flip side to this is "control nothing". Buy the building your office is in and own an asset, or get a triple net lease and then pay margin on top of that. Own your own hardware or pay AWS to have 30percent profit margins...