In more traditional industries investors seem to prefer less integration. One example being Siemens, who divested their Healthineers and Energy divisions and all their share values increased by a lot.
Maybe this is because these industries are better understood and there is less risk involved, but I wonder if the current big software companies will take similar paths in the future.
Investors often prefer stocks that are not themselves a portfolio (like AWS and Amazon retail being bundled; or your Siemens example). Lots of people would like to buy into AWS's margins without also buying Amazon retail's margins. But this is different from vertical integration that creates competitive advantage.