That's the absolute key, isn't it? Nobody is being shackled, but the timing is up to us. We aren't in debt, we don't need to sell, we will trade but not when doing so makes us weaker.
Thing is, life is full of people. Actual , three dimensional people. And they all have their own perspective and agenda, which may differ from our business plan.
I remember Ferguson saying, after United had sold Ronaldo to Madrid, that they had done well to keep him for the final year. This is a paid employee, under contract, and the most successful manager ever is talking in terms of having done a good job just to hold him to the terms the player had willingly signed up to.
Life ain't simple, I suppose.