The question of the proper scope of Senate questioning, or more precisely, the nominee's answers, is a good one.
Senators can obviously ask whatever they want to, and some like to use their time for monologues rather than questions (though with Senator Biden off the dais, the proportion of question time to monologue time might rise somewhat). Nominees similarly have to decide how fulsome an answer to give, if any, and they will be judged on that unless the answer is just a conclusory statement in tension with the nominee's record. In that case, it is better to judge the nominee by her record and not the self-serving contradictory testimony.
I think that the "Ginsburg standard" (coined based upon RBG's 1993 hearings, when she said she would give "no hints, no forecasts, no previews" regarding how she might rule on cases that may come before the Court) is generally correct, but only if there is a basis to assume in good faith that the nominee will, as the Constitution and her statutory judicial oath require, be impartial in dispensing justice "without respect to persons."