While water injection did a good job at what it was intended to do (cool the incoming air to keep peak temperatures down), it was really hard on the engine. In addition to the higher thrust settings and all the wear associated with that, the water didn't immediately atomize when injected - the impact of the water droplets deep in the compressor tended to erode the compressor blades (unlike at the inlet where the blades are designed to withstand some debris impacts, the compressor blades deep in the compressor assume all the nasty stuff has evaporated or been centrifuged out and are relatively fragile).
Very important to use reasonably pure water (demineralized or distilled) to avoid mineral deposits on the compressor blades - really messes up the aerodynamics of the blades, plus large deposits can shed causing downstream damage.