Borderline of being a staff-level machine learning engineer at a large technology company, and despite getting an exceptional review (and completing a major pro

Borderline of being a staff-level machine learning engineer at a large technology company, and despite getting an exceptional review (and completing a major product delivery), I will also be getting a sub-inflation comp adjustment. Already started interviewing, early indications and offers suggest a 40-60% pay jump is within reach, possibly more with equity. I just don't understand why companies do this to themselves.