Vilas , the problem is that you didn't give Airbus procedure , at least not till challenged . Most others did specify that "their company ...."
Sure. One doesn't read FCU but PFD changes on FMA, HDG, Altitude, speed selected or managed by change of colour needs to be called.
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My issue is you continuously , whether intentionally or not , post strongly worded statements ( need , must etc. ) . No problem with discussing , but when you say (need , must) without qualifying your statement as "Standard Airbus" as opposed to FCOM/FCTM procedures practiced by many operators , then expect the statements to be challenged because you are not stating an option .You are stating it IS so !
BTW ,the document posted still does stand up to scrutiny . Whether it is that you cannot or choose not to post it( not copy/paste), or give a reference , with an Airbus logo , then I am afraid that it cannot validate your argument that it is even an Airbus procedure .