I think you're talking about a different kind of optionality than the parent post. That was talking about option to expand/contract capacity, change infrastruct

I think you're talking about a different kind of optionality than the parent post. That was talking about option to expand/contract capacity, change infrastructure, or all the usual "elasticity" that they tout. You're talking about vendor lock-in. Which is a totally valid point and something to be aware of, but basically orthogonal.