LFB can be very helpful, to me at least, during stead state cornering (think cloverleafs in street terms). When trying to modulate at-the-limit corning atitude with only steering and throttle, it's very easy to get into a back and forth under/oversteer pattern which can be kinda messy. Especially on cars with big turbos that experience compressor surge or boost loss during such throttle usage.
Instead, simply "breathing" gently on the brake with the left foot to adjust cornering atitude while keeping throttle reasonably neurtral can be an alternative. But there are others far more experienced in this subject than myself so YMMV.
FWIW, a good place to practice left foot braking is rental cars since they always have auto transmissions, plenty of footwell area and service intervals that are not your concern
cheers,
shiv