Cicero and others seem to infer that all true Epicureans will choose to spend their lives laying on the beach without a thought to (for example) a life as an artist or a scientist or a policeman or fireman.
What's his argument?
how do you explain the Epicurean analysis of choosing some pleasures over others in Epicurean terms without reference to nobility or other outside standards?
Which possible epicurean standards (or procedure) do you have in mind?
Are you looking for a foundation or justification of the standard(s) in question?