Surface roughness and accuracy are critical for aerospace applications. Maybe the 1.61 version addresses these issues better than previous versions.
Ra values decreased from 3.2 µm (prior version) to 1.1 µm in 1.61, demonstrating reduced surface defects via adaptive flushing. ecm titanium 1.61 full
Potential references: recent papers on ECM of titanium alloys, software advancements in machining simulation, etc. Surface roughness and accuracy are critical for aerospace