What are you even saying? You're not even answering the question I posed to you. Just going off on another tangent doesn't mean you've defeated an argument.
"Switching for diff covenant is proactive and engaged" no it's not.. switching talents to fit a specific fight isn't engaging at all unless you're defining "engaging" as "I push buttons". Then someone can keep casting Arcane Intellect over and over and that must be the most engaging gameplay right?
And again, don't know how many times I gotta bring this up but Covenants have more attached to them than the covenant active ability.
What are you going to do if they do make covenant abilities switchable but then the Soulbind that synergies best with your chosen ability is in another Covenant? Are you gonna say 'let players pick which Soulbinds they want too!!!' then? What about specific legendaries that require specific covenants?
Are you going to start asking for all those to be choose-able/switch-able at whim too? Then picking a Covenant literally does not matter which is the opposite of their goal in the first place.