Trade-off between LDO max Iout AND PSRR
PSRR depends on the high-frequency gain of the regulator feedback loop.

If the power-dissipation device has lots of capacitance to charge and discharge, them the regulator loop needs HIGH operating current.

However, the LDO also needs suitable awareness of the risks of sloppy attention to IC LAYOUT.

Diagnosing an LDO with poor PSRR even at 60Hz, I eventually noticed the UNREG input metal was directly over the huge area of a high-value (10 Meg Ohm) feedback resistor.