A good counterpoint is that evolution requires a certain amount of chaos to explore the solution space. By limiting the portfolio, you also limit how the solutions can evolve.
That's managed. You don't allow everyone to run pell-mell to see what works best. They never come back together and agree on a stack, and even if they did, there's zero will or funding to retrofit the systems onto the agreed-upon stack. Meanwhile, all the political infighting by those advocating for their preferred stack creates a bad work environment and cliques.
