Rigid use of the index finger as a capo is usually the mantra for students of barre chord placement. They focus on the clamping of that finger as capo-like as possible, thinking this and no other method is best.
The barre is not really a barre. By all appearances it is and hence the name but it does not need to sound all strings. It typically only needs to sound 2 to 3 strings. The e-strings are usually covered by the index finger with the balance of the notes between them chord-specific and typically the work of the other fingers.
The index finger will eventually adapt itself to sound only those strings it needs to sound. It will be relieved by the other fingers as they sound their fretted notes.
At this juncture I find placement of barre chords to be of no greater effort than placing open chords. That's just what comes from practice.
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