That requires both time and effort to achieve. It won’t be an easy process.
Simply choosing correctly on the UI requires neither.
Sure, but choosing the correct gear and talents and Covenants will help you at every level. Be it your Normal drunk raid run, your casual Heroic guild or the Mythic raiding guys.
Sure it does. It disproves that Covenants were anything other than what the player base predicted : a poorly balanced math problem to solve. Blizzard failed to listen and now the game is suffering because of it.