And what does TREBLE mean, "practically"?
These r merely terms, describing the sound.
Well recorded trax join 2gether 2 produce a good picture, phase-wise.
Poorly recorded trax with phase PROBLEMS interfere with each other, smearing the picture, "coloring" frequency bands, "howling, "ringing" etc.
That's y 1 needs "uncle engineer" who knows WHERE 2 place the mics, and how 2 align them 4 good phase.
Having said that we may use phase shift deliber8ly, if we're after a certain color.
Coicident mic placements (xy, m-s, ortf etc.) rely on phase cancelations 2 produce a stereo image, 4 yet another example.
In the mix U need 2 identify phase PROBLEMS, balance or mute trax accordingly, shift them in time, re-record, whatever.
There r number of hardware and software tools 4 manipul8ing phase, which if CAREFULLY and WISELY used may help.